- .su
- 10th Congress of the Russian Communist Party (Bolsheviks)
- 1st Conference of the Communist Parties of Latin America
- 22nd Congress of the Communist Party of the Soviet Union
- 28th Congress of the Communist Party of the Soviet Union
- 1905 Russian Revolution
- 1919 Emergency National Convention
- 1924 Estonian coup d'état attempt
- 1924 Soviet Constitution
- 1934 Declaration of Principles
- 1965 Soviet economic reform
- 1987 Socialist Left Party national convention
- 1991 Soviet coup d'état attempt
- A. Philip Randolph
- Abkhaz Autonomous Soviet Socialist Republic
- Active measures
- Adjar Autonomous Soviet Socialist Republic
- Adolph Germer
- African Blood Brotherhood
- African Party for the Independence of Cape Verde
- African socialism
- Aggravation of class struggle under socialism
- Algernon Lee
- Algie Martin Simons
- All-Union Communist Party Bolsheviks
- Allan L. Benson
- Alliance for Workers' Liberty
- Alternative libertaire
- Amana Colonies
- American Labor Party 1932
- American Workers Party
- Anarchism and Marxism
- Anarchist communism
- Anarcho-syndicalism
- Andrew Pulley
- Anti-Bolshevik League incident
- Anti-capitalism
- Anti-Imperialist National Democratic Front
- Anti-Leninism
- Anti-Soviet agitation
- Arab Communist Party
- Arab Socialist Movement
- Arab socialism
- Argentine Libertarian Federation
- Armenian Communist Party
- Armenian Revolutionary Federation
- Armenian Soviet Socialist Republic
- Arrin Hawkins
- Ash heap of history
- August Gillhaus
- Australian Labor Party
- Autonomism
- Autonomous republics of the Soviet Union
- Azerbaijan Communist Party (1993)
- Azerbaijan Communist Party
- Azerbaijan Soviet Socialist Republic
- Ban on factions in the Russian Communist Party
- Barbara Garson
- Bashkir Autonomous Soviet Socialist Republic
- Battle of Smolensk (1943)
- Benjamin Gitlow
- Benjamin Hanford
- Berne International
- Bernie Sanders
- Bhutan Communist Party (Marxist–Leninist–Maoist)
- Bhutan Tiger Force
- Bill Van Auken
- Black Radical Congress
- Black Sea Soviet Republic
- Bob Avakian
- Bolesław Gebert
- Bolshevik Communist Party
- Bolshevik Current for the Fourth International
- Bolshevik Party for the Fourth International
- Boris Pugo
- Brian Moore (politician)
- Broad Front (Uruguay)
- Brook Farm
- Buddhist socialism
- Bulgarian Communist Party
- Bulgarian coup d'état of 1944
- Bundism
- Buryat Autonomous Soviet Socialist Republic
- Byelorussian Soviet Socialist Republic
- Carl D. Thompson (Social Democrat)
- Carl Sandburg
- Castroism
- Central Commission for Discipline Inspection of the Communist Party of China
- Central Committee of the Communist Party of China
- Central Committee of the Communist Party of the Soviet Union
- Central Party School of the Communist Party of China
- Central Reorganisation Committee, Communist Party of India (Marxist–Leninist)
- Central and Eastern Minnesota Socialist Party
- Ceylon Communist Party (Maoist)
- Charles Edward Russell
- Charles Fourier
- Charles H. Kerr Company Publishers
- Charles Hunter Corregan
- Charles Matchett
- Charles Ruthenberg
- Charles Solomon (politician)
- Che Guevara
- Chechen–Ingush Autonomous Soviet Socialist Republic
- Chicago Socialist Party
- Chinese Peasants' and Workers' Democratic Party
- Chinese Soviet Republic
- Chinese socialism
- Christian Rakovsky
- Christian communism
- Chuvash Autonomous Soviet Socialist Republic
- Clandestine Colombian Communist Party
- Class conflict
- Class consciousness
- Class struggle
- Classless society
- Claude Henri de Rouvroy, comte de Saint-Simon
- Clifton DeBerry
- Comintern
- Committee for a Workers' International
- Committee for the Preservation of the Socialist Party
- Committees of Correspondence for Democracy and Socialism
- Commune of the Working People of Estonia
- Communism
- Communist Action Organization in Iraq
- Communist Labor Party
- Communist Labor Party of North America
- Communist League
- Communist League of America
- Communist Organization of Greece
- Communist Party (Bolsheviks) of Ukraine
- Communist Party (Marxist–Leninist) of Panama
- Communist Party in Saudi Arabia
- Communist Party of Abkhazia
- Communist Party of Annam
- Communist Party of Belarus
- Communist Party of Bolivia
- Communist Party of Brazil
- Communist Party of Bukhara
- Communist Party of Byelorussia
- Communist Party of China
- Communist Party of Cuba
- Communist Party of Estonia
- Communist Party of Georgia
- Communist Party of Germany (1990)
- Communist Party of Germany (Opposition)
- Communist Party of Germany
- Communist Party of Great Britain (Provisional Central Committee)
- Communist Party of Greece
- Communist Party of Holland – Central Committee
- Communist Party of India (Marxist)
- Communist Party of India (Marxist–Leninist) Bolshevik
- Communist Party of India (Marxist–Leninist) Central Team
- Communist Party of India (Marxist–Leninist) Second Central Committee
- Communist Party of Kazakhstan
- Communist Party of Khorezm
- Communist Party of Kirghizia
- Communist Party of Korea
- Communist Party of Latvia
- Communist Party of Lithuania
- Communist Party of Mexico (Marxist–Leninist)
- Communist Party of Moldova
- Communist Party of Nepal (Marxist–Leninist–Maoist Centre)
- Communist Party of Nepal (Mashal)
- Communist Party of Nepal (Unity Centre)
- Communist Party of Nepal (Unity Centre – Masal)
- Communist Party of Poland
- Communist Party of Pridnestrovie
- Communist Party of Spain (Marxist–Leninist)
- Communist Party of Sri Lanka
- Communist Party of Tajikistan
- Communist Party of Turkestan
- Communist Party of Turkey/Marxist–Leninist (Maoist Party Centre)
- Communist Party of Turkey/Marxist–Leninist
- Communist Party of Turkmenistan
- Communist Party of Ukraine (renewed)
- Communist Party of Ukraine
- Communist Party of Uruguay
- Communist Party of Uzbekistan
- Communist Party of the Russian Federation
- Communist Party of the Soviet Union (1992)
- Communist Party of the Soviet Union
- Communist Party of the USA (Opposition)
- Communist Romania
- Communist University of the Toilers of the East
- Communist Voice Organization
- Communist Workers' Group (New Zealand)
- Communist Workers' International
- Communist Workers' Party (United States)
- Communist Workers' Party of Germany
- Communist revolution
- Communist revolution
- Communist symbolism
- Confederación Nacional del Trabajo
- Conference for Progressive Political Action
- Congress Party for the Independence of Madagascar
- Constitution of the Socialist Federal Republic of Yugoslavia
- Constitution of the Soviet Union
- Coordinating Committee for the Refoundation of the Fourth International
- Coordination Committee of Maoist Parties and Organisations of South Asia
- Corliss Lamont
- Council communism
- Crimean Autonomous Soviet Socialist Republic
- Criticisms of Marxism
- Criticisms of socialism
- Critique of the Gotha Program
- Croatian Peasant Party
- Cuban Democratic Socialist Current
- Daily Worker
- Dan La Botz
- Daniel De Leon
- Daniel Hoan
- Darlington Hoopes
- David McReynolds
- David P. Berenberg
- De-Stalinization
- De Leonism
- Deformed workers' state
- Degenerated workers' state
- Deirdre Griswold
- Democratic Republic of Afghanistan
- Democratic Social-Revolutionary Party of Cuba
- Democratic Socialist Organizing Committee
- Democratic Socialists of America
- Democratic socialism
- Democratisation in the Soviet Union
- Diane Drufenbrock
- Dissolution of the Soviet Union
- Dmitry Yazov
- Domino theory
- Donetsk-Krivoy Rog Soviet Republic
- East Germany
- Eastern Bloc
- Eat the Rich (book)
- Eco-socialism
- Economic inequality
- Ed Shaw
- Eduard Bernstein
- Eduard Limonov
- Edward Spencer Beesly
- Egyptian Arab Socialist Party
- Egyptian Marxist Organisation
- Egyptian Socialist Party
- Election Results of Communist Party of India (Marxist)
- Ella Reeve Bloor
- Emil Herman
- Emil Seidel
- Era of Stagnation
- Eric Chester
- Eric Hass
- Ernest Untermann
- Estonian Soviet Socialist Republic
- Eugene Puryear
- Eugene V. Debs
- Eurocommunism
- Evelyn Reed
- FRELIMO
- Fabian Society
- Farrell Dobbs
- February Revolution
- Federación Anarquista Ibérica
- Ferdinand Lassalle
- Fieldites
- Fifth International
- Flag of the Russian Soviet Federative Socialist Republic
- Flag of the Soviet Union
- Flags of the Soviet Republics
- Foro de São Paulo
- Fourth International (ICR)
- Fourth International (Post-Reunification)
- Fourth International Posadist
- Fourth International
- Frank Lovell
- Frank Raguse
- Frank Zeidler
- Frankfurt School
- François-Noël Babeuf
- Fred Ellis
- Fred Feldman
- Fred Goldstein
- Fred Halstead
- Fred Newman
- Frederic Heath
- Frederick Krafft
- Freedom Road Socialist Organization
- Freedom Socialist Party (Oregon)
- Freedom Socialist Party
- Free speech fights
- French Communist Party
- French Revolution of 1848
- French Section of the Workers' International
- French Turn
- Friedrich Engels
- Fusion of Haitian Social Democrats
- Galician Soviet Socialist Republic
- Gang of Eight (Soviet Union)
- Gavrielle Holmes
- General German Workers' Association
- General line of the party
- General strike
- Gennady Yanayev
- George A. Nelson
- George Odger
- George R. Lunn
- George Rapp
- George Ross Kirkpatrick
- George W. Woodbey
- Georgian Communist Party
- Georgian Soviet Socialist Republic
- German Communist Party
- German Revolution of 1918–19
- Glasnost
- Gloria La Riva
- Goulash Communism
- Government of the Soviet Union
- Grace Carlson
- Great Patriotic War (term)
- Great Purge
- Greensboro massacre
- Grigory Zinoviev
- Guevarism
- Guild socialism
- Gulag
- Hailufeng Soviet
- Hammer and sickle
- Harmony, Pennsylvania
- Harmony Society
- Harry Ring
- Harry W. Laidler
- Henri Tolain
- Henry Teigan
- Herbert C. Holdridge
- Herbert Lewin
- Hermon F. Titus
- History of Poland (1945–1989)
- History of communism
- History of socialism
- History of socialism in Great Britain
- History of the Communist Party of the Soviet Union
- History of the Portuguese Communist Party
- History of the Socialist Left Party
- History of the Soviet Union
- History of the cooperative movement
- History of the socialist movement in Brazil
- History of the socialist movement in the United States
- Homer Bone
- Hoxhaism
- Hunan–Hubei–Jiangxi Soviet
- Hunan–Hubei–Sichuan–Guizhou Soviet
- Hunan–Jiangxi Soviet
- Hungarian Socialist Workers' Party
- Hungarian Soviet Republic
- Hungarian Working People's Party
- Icarians
- Independent-Socialist Party
- Independent Social Democratic Party of Germany
- Indochinese Communist Party
- Industrial Union Party
- Industrial Workers of Great Britain
- Intercollegiate Socialist Society
- International of Anarchist Federations
- International Bolshevik Tendency
- International Centre of Orthodox Trotskyism
- International Committee of the Fourth International
- International Communist Current
- International Communist League (Fourth Internationalist)
- International Communist League (Vietnam)
- International Communist Party
- International Conference of Marxist–Leninist Parties and Organizations (International Newsletter)
- International Conference of Marxist–Leninist Parties and Organizations (Unity & Struggle)
- International League for the Reconstruction of the Fourth International
- International Libertarian Solidarity
- International Marxist Tendency
- International Red Aid
- International Revolutionary Marxist Centre
- International Socialist League (Latin America)
- International Socialist Organisation (Australia)
- International Socialist Review (1900)
- International Socialist Tendency
- International Socialists (Canada)
- International Trotskyist Committee for the Political Regeneration of the Fourth International
- International Trotskyist Fraction
- International Trotskyist Opposition
- International Union of Socialist Youth
- International Workers' Committee
- International Workers' Day
- International Workers' Unity (Fourth International)
- International Workers League (Fourth International)
- International Workers Party
- International Working Union of Socialist Parties
- International Workingmen's Association
- Internationalist Communist Union
- Iraq Freedom Congress
- Iron Law of Wages
- Iskra (Egyptian communist organisation)
- Islamic socialism
- Israel Amter
- Israeli Labor Party
- Italian Socialist Party (2007)
- J. Edward Hall
- J. Henry Stump
- J. Mahlon Barnes
- J. Quinn Brisben
- Jack Barnes
- Jackson Stitt Wilson
- Jacob Panken
- James H. Maurer
- James Harris (politician)
- James Oneal
- James P. Cannon
- James Warren (presidential candidate)
- January Uprising
- Japanese Communist Party
- Jasper McLevy
- Jewish Socialist Federation
- Jiangxi–Fujian Soviet
- Job Harriman
- Joel Britton
- John A. C. Menton
- John M. Work
- John Parker (activist)
- John Spargo
- John Stuart Mill
- John T. McManus
- Joseph Cannon (socialist)
- Josip Broz Tito
- Julius Nyerere
- KGB
- Kabardin Autonomous Soviet Socialist Republic
- Kabardino-Balkar Autonomous Soviet Socialist Republic
- Kalmyk Autonomous Soviet Socialist Republic
- Karakalpak Autonomous Soviet Socialist Republic
- Karelian Autonomous Soviet Socialist Republic
- Karelo-Finnish Soviet Socialist Republic
- Karl Marx
- Kate Richards O'Hare
- Kazak Autonomous Soviet Socialist Republic
- Kazakh Soviet Socialist Republic
- Khrushchev Thaw
- Kirghiz Soviet Socialist Republic
- Komi Autonomous Soviet Socialist Republic
- Komsomol
- Korean Social Democratic Party
- Kremlin Wall Necropolis
- Kronstadt rebellion
- Kuban Soviet Republic
- Kuomintang
- Kurdistan Communist Party – Iraq
- Kurdistan Women's League
- La Reunion (Dallas)
- Labor Party (United States, 1996)
- Labor Zionism
- Labour Party of Iran
- Labour and Socialist International
- Lao People's Revolutionary Party
- Larry Holmes (activist)
- Latvian Socialist Soviet Republic
- Latvian Soviet Socialist Republic
- Laurence Gronlund
- League against Imperialism
- League for Social Reconstruction
- League for Socialist Reconstruction
- League for the Fifth International
- League for the Fourth International
- League for the Revolutionary Party
- League of Communists of Yugoslavia
- League of Revolutionaries for a New America
- League of Revolutionary Black Workers
- Left-wing politics
- Left Front
- Left Socialist-Revolutionaries
- Left Wing Section of the Socialist Party
- Left-wing uprisings against the Bolsheviks
- Left Worker-communist Party of Iraq
- Left communism
- Lenin Boys
- Leninism
- Leninist League (US)
- Leninist–Trotskyist Tendency
- Leon Trotsky
- Leonid Brezhnev
- Leslie Feinberg
- Lev Kamenev
- Liaison Committee for the Reconstruction of the Fourth International
- Liaison Committee of Militants for a Revolutionary Communist International
- Libertarian Book Club
- Libertarian League
- Libertarian Marxism
- Libertarian Youth
- Libertarian socialism
- Liberty Union Party
- Lin Biao
- Linda Jenness
- List of New York State Legislature members expelled or censured
- List of Trotskyist internationals
- List of communist ideologies
- List of communist parties
- List of current communist states
- List of elected socialist mayors in the United States
- List of left-wing internationals
- List of members of the Politburo of the Russian Communist Party (bolsheviks) in the 1910s
- List of members of the Socialist Party of America
- List of political ideologies
- List of socialist countries
- Lithuanian Soviet Socialist Republic (1918–1919)
- Lithuanian Soviet Socialist Republic
- Lithuanian–Belorussian Soviet Socialist Republic
- Louis B. Boudin
- Louis Blanc
- Louis Waldman
- Luxemburgism
- Lysenkoism
- Makhnovism
- Maki (current political party)
- Malayan Communist Party
- Mao Zedong
- Margaret Trowe
- Mari Autonomous Soviet Socialist Republic
- Market socialism
- Martin Koppel
- Marxism
- Marxism and religion
- Marxism–Leninism
- Marxism–Leninism–Maoism–Prachanda Path
- Marxist philosophy
- Marxist–Leninist Communist Party of Venezuela
- Marxist–Leninist Party, USA
- Marxist–Leninist–Maoist Tendency
- Mary Alice Herbert
- Mary Cal Hollis
- Mass graves in the Soviet Union
- Mass killings under Communist regimes
- Matilde Zimmermann
- Maurice Barrès
- Max Bedacht
- Max S. Hayes
- Max Shachtman
- Max Weber
- May Day Riots of 1919
- Maynard C. Krueger
- McCarthyism
- Melvin T. Mason
- Mengistu Haile Mariam
- Menshevik
- Mexican Communist Party
- Meyer London
- Mikhail Gorbachev
- Mixed economy
- Moldavian Autonomous Soviet Socialist Republic
- Moldavian Soviet Socialist Republic
- Mongolian People's Party
- Monica Moorehead
- Mordovian Autonomous Soviet Socialist Republic
- Morris Hillquit
- Moscow Sun Yat-sen University
- Moses Hull
- Mountain Autonomous Soviet Socialist Republic
- Movement (Trotskyist)
- Movement for a United Communist Party of Greece
- Mughan Soviet Republic
- Myra Tanner Weiss
- Nakhichevan Autonomous Soviet Socialist Republic
- Narodnaya Gazeta
- Nasserism
- National Bolshevik Front
- National Bolshevism
- National Democratic Party (Egypt)
- National Guardian)
- National Liberation Front – Bahrain
- National Progressive Front
- National Socialism
- National communism
- National conventions of the Communist Party USA
- Naxalite
- Nehruism
- Nelson Peery
- Neo-Marxism
- Nepalese Civil War
- New American Movement
- New Communist Movement
- New Communist Party Of The Netherlands
- New Communist Party of Britain
- New Harmony, Indiana
- New International
- New Jewel Movement
- New People's Party (Korea)
- New Soviet man
- New Union Party
- New York Communist
- New York state election, 1932
- New York state election, 1933
- New York state election, 1934
- Nikita Khrushchev
- No War but the Class War
- Noam Chomsky
- Nomenklatura
- Non-English press of the Communist Party USA
- Nonviolent revolution
- Norman Thomas
- North Ossetian Autonomous Soviet Socialist Republic
- Northeastern Jiangxi Soviet
- October Revolution
- Old Guard faction
- Oleg Baklanov
- Olive M. Johnson
- Oneida Community
- Opium of the people
- Organisation of Marxists–Leninists of Greece
- Organisation of Marxist–Leninist Communists of Greece
- Organising Committee for the Reconstruction of the Fourth International
- Organization Department of the Communist Party of China Central Committee
- Organization for the Reconstruction of the Communist Party of Greece
- Organization of Iranian People's Fedaian (Majority)
- Organizing Committee of Principist Trotskyism (Fourth International)
- Orthodox Trotskyism
- Oskar R. Lange
- POUM
- Palestine Communist Party
- Palmer Raids
- Panhellenic Socialist Movement
- Paris Commune
- Party for Socialism and Liberation
- Party of Communist Unification in the Canaries
- Party of Communists of the Republic of Moldova
- Party of Democratic Socialism (Germany)
- Party of European Socialists
- Party of Italian Communists
- Party of Labour of Albania
- Party of Mexican Communists
- Party of Narodnik Communists
- Party of Revolutionary Communism
- Party of Socialists of Moldova "Motherland"
- Party of the Democratic Revolution
- Pathfinder tendency
- Paul Boutelle
- Paul Montauk
- Pavlik Morozov
- Peace and Freedom Party
- People's Action Party
- People's Democratic Party of Afghanistan
- People's Democratic Party of Uzbekistan
- People's Democratic Republic of Ethiopia
- People's Republic of China
- People's Republic of Poland
- People's Revolutionary Government
- People's Revolutionary Party (Vietnam)
- People's Revolutionary Party of Benin
- People's war
- Perestroika
- Permanent Revolution (group)
- Permanent revolution
- Persian Socialist Soviet Republic
- Peter Camejo
- Petite bourgeoisie
- Pierre-Joseph Proudhon
- Pierre Leroux
- Polish Socialist Party
- Polish United Workers' Party
- Polish Workers' Party
- Polish communism
- Polish–Soviet War
- Politburo of the Central Committee of the Communist Party of the Soviet Union
- Political and Legislative Affairs Committee of the Communist Party of China
- Political revolution
- Politics of the People's Republic of China
- Popular Socialist Party (Cuba)
- Post-capitalism
- Poul Nyrup Rasmussen
- POUM
- Prague Spring
- Pre-Marxist Communism
- Predictions of Soviet collapse
- President of the Soviet Union
- Presidium of the Supreme Soviet
- Presidium of the Supreme Soviet of the Russian SFSR
- Pridnestrovian Moldavian Soviet Socialist Republic
- Pridnestrovie Communist Party
- Primitive communism
- Program of the Communist Party of the Soviet Union
- Progressive Alliance of Socialists and Democrats
- Progressive Labor Party (United States)
- Progressive Party of Working People
- Proletarian Party of America
- Proletarian Society of China
- Proletariat
- Propaganda Department of the Communist Party of China
- Propaganda in the Soviet Union
- Provisional Central Committee, Communist Party of India (Marxist–Leninist)
- Provisional Communist Party
- Provisional Revolutionary Government of the Republic of South Vietnam
- Purges of the Communist Party of the Soviet Union
- Radical Party (France)
- Radical Socialist Party (Luxembourg)
- Ray O. Light
- Real socialism
- Red (Norway)
- Red Flag Party
- Red Peasant International
- Red Scare
- Red Sport International
- Red Terror
- Red-green-brown alliance
- Religious communism
- Revisionism (Marxism)
- Revolutionary Communist Group of Colombia
- Revolutionary Communist Party, USA
- Revolutionary Communist Party of Britain (Marxist–Leninist)
- Revolutionary Communist Party of Canada
- Revolutionary Communist Vanguard
- Revolutionary Insurrectionary Army of Ukraine
- Revolutionary Internationalist Movement
- Revolutionary Marxist League
- Revolutionary Party of the Proletariat
- Revolutionary Socialist Labor Party
- Revolutionary Socialist Party (UK)
- Revolutionary Workers Ferment
- Revolutionary Workers Headquarters
- Revolutionary Workers League (Oehlerite)
- Revolutionary base area
- Revolutionary socialism
- Revolutions of 1917–23
- Revolutions of 1989
- Ricardian socialism
- Richard B. Moore
- Richard Congress
- Richard Müller (socialist)
- Robert Dale Owen
- Robert M. La Follette, Sr.
- Robert Minor
- Robert Owen
- Romanian Communist Party
- Romanian Social Democratic Party (defunct)
- România Muncitoare
- Ron Ehrenreich
- Rosa Luxemburg
- Rose Pastor Stokes
- Russian Constitution of 1918
- Russian Maoist Party
- Russian Section of the Committee for a Workers' International
- Russian Social Democratic Labour Party
- Russian Soviet Federative Socialist Republic
- Róger Calero
- SWAPO
- Saint-Simonianism
- Sam DeWitt
- Sam Faubus
- Samuel H. Friedman
- Samuel Orr
- Saur Revolution
- Scientific Communism
- Scientific Socialism
- Second International
- Second World
- Secretariat of the Communist Party of China Central Committee
- Secretary of the Communist Party of Cuba
- Sewer Socialism
- Seymour Stedman
- Shachtmanism
- Shakers
- Shining Path
- Sino-Vietnamese War
- Sino–Soviet border conflict
- Sino–Soviet split
- Slovak Soviet Republic
- Social Democracy of America
- Social Democracy of the Kingdom of Poland and Lithuania
- Social Democratic Federation (U.S.)
- Social Democratic Federation (U.S., 1889)
- Social Democratic Party (Japan)
- Social Democratic Party (United States)
- Social Democratic Party of Germany
- Social Democratic Party of Pridnestrovie
- Social Democratic Workers' Party of Germany
- Social Democrats USA
- Social anarchism
- Social democracy
- Social stratification
- Socialism (Marxism)
- Socialism for the rich and capitalism for the poor
- Socialism in One Country
- Socialism of the 21st century
- Socialism: Utopian and Scientific
- Socialist-Revolutionary Party
- Socialist Action (U.S.)
- Socialist Equality Party (United States)
- Socialist Federal Republic of Yugoslavia
- Socialist Industrial Unions
- Socialist International
- Socialist Labor Party of America
- Socialist Labour Party (Canada)
- Socialist Labour Party (UK, 1903)
- Socialist Orders of Merit
- Socialist Party (South Korea)
- Socialist Party USA
- Socialist Party of America
- Socialist Party of California
- Socialist Party of Canada
- Socialist Party of Chile
- Socialist Party of Colorado
- Socialist Party of Connecticut
- Socialist Party of Florida
- Socialist Party of France (1902)
- Socialist Party of Great Britain breakaway groups
- Socialist Party of Great Britain debates
- Socialist Party of Kansas
- Socialist Party of Massachusetts
- Socialist Party of Michigan
- Socialist Party of Moldova
- Socialist Party of New Jersey
- Socialist Party of New York
- Socialist Party of Ohio
- Socialist Party of Oklahoma
- Socialist Party of Oregon
- Socialist Party of Romania
- Socialist Party of Texas
- Socialist Party of Uruguay
- Socialist Party of Vietnam
- Socialist Party of Washington
- Socialist Party of Wisconsin
- Socialist People's Republic of Albania
- Socialist Soviet Republic of Abkhazia
- Socialist Soviet Republic of Byelorussia
- Socialist Trade and Labor Alliance
- Socialist Union Party
- Socialist Union of Popular Forces
- Socialist Unity Party of Germany
- Socialist Worker
- Socialist Workers' Party of China
- Socialist Workers' Party of Germany
- Socialist Workers Front (Marxist–Leninist)
- Socialist Workers Party (Palestine)
- Socialist Workers Party (United States)
- Socialist Youth of Spain
- Socialist economics
- Socialist-Revolutionary Party
- Social revolution
- Society of Christian Socialists
- South African Communist Party
- Soviet (council)
- Soviet Central Asia
- Soviet democracy
- Soviet influence on the peace movement
- Soviet Invasion of Xinjiang
- Soviet Union
- Sovietization
- Soviet of Nationalities
- Soviet of the Union
- Soviet republic (system of government)
- Soviet ruble
- Soviet space program
- Soviet war in Afghanistan
- Spanish Communist Workers' Party (1973)
- Spanish Socialist Workers' Party
- Spartacist uprising
- Stalinist repressions in Mongolia
- State capitalism
- State ideology of the Soviet Union
- Stateless communism
- Stavropol Soviet Republic
- Stewart Alexander (politician)
- Subdivisions of the Soviet Union
- Sudanese Communist Party
- Supreme Soviet of the Soviet Union
- Sylvia Pankhurst
- Syndicalist League of North America
- Syrian Communist Party
- Syrian Communist Party (Bakdash)
- Syrian Communist Party (Unified)
- Ta Thu Thau
- Taiwan Communist Party
- Taiwanese Communist Party
- Tajik Soviet Socialist Republic
- Tatar Autonomous Soviet Socialist Republic
- Taurida Soviet Socialist Republic
- Teresa Gutierrez
- The ABC of Communism
- The Communist Manifesto
- The Communist Party USA and African-Americans
- The Conquest of Bread
- The Militant
- The Origin of the Family, Private Property and the State
- The Other America
- The Trend
- The Workmen's Circle
- Their Trotsky and Ours
- Third World Socialism
- Third camp
- Thomas Duncan (Wisconsin legislator)
- Three Principles of the People
- Three Worlds Theory
- Timeline of the Great Purge
- Timeline of the Naxalite-Maoist insurgency
- Titoism
- Tom Maidhc O'Flaherty
- Tony Cliff
- Trade Unionist and Socialist Coalition
- Transcaucasian Socialist Federative Soviet Republic
- Transitional demand
- Treaty on the Creation of the USSR
- Trotskyism
- Trotskyist Fraction – International Strategy
- Trotskyist International Liaison Committee
- Trotskyist League (US)
- Tucker P. Smith
- Turkestan Autonomous Soviet Socialist Republic
- Turkmen Soviet Socialist Republic
- Tuvan Autonomous Soviet Socialist Republic
- Tuvan People's Revolutionary Party
- Twenty-one Conditions
- Types of socialism
- U.S. Marxist–Leninist Organization
- Udmurt Autonomous Soviet Socialist Republic
- Ukrainian Soviet Socialist Republic
- Ultra-leftism
- Unified Communist Party of Nepal (Maoist)
- Unified Party of Haitian Communists
- Union of Iranian Communists (Sarbedaran)
- Union of People's Fedaian of Iran
- Union of Sovereign States
- United Front (PRC)
- United Hebrew Trades
- United States Socialist-Labor Party
- Utopian socialism
- Uzbek Soviet Socialist Republic
- Valentin Pavlov
- Vanguard party
- Vasily Starodubtsev
- Victor L. Berger
- Victor Prosper Considerant
- Viet Nam Quoc Dan Dang
- Vietnamese Fatherland Front
- Vietnamese Trotskyism
- Vladimir Kryuchkov
- Vladimir Lenin
- Volga German Autonomous Soviet Socialist Republic
- Wage Workers Party
- Walt Brown
- War communism
- Warsaw Pact
- West Ukrainian People's Republic
- Wilhelm Rosenberg
- Willa Kenoyer
- William Dwight Porter Bliss
- William F. Dunne
- William Mailly
- William Weinstone
- William Z. Foster
- Willie Mae Reid
- Worker-communist Party of Iran
- Worker-communist Party of Iran
- Worker-communist Party of Iran – Hekmatist
- Worker-communist Party of Iraq
- Workerism
- Workers' Council of the United States
- Workers' International Industrial Union
- Workers' Party (Turkey)
- Workers' Party of Ethiopia
- Workers' Party of Korea
- Workers' Power (UK)
- Workers' Voice
- Workers' council
- Workers Committee for National Liberation – Political Organisation for the Working Class
- Workers International to Rebuild the Fourth International
- Workers Party (U.S.)
- Workers Party of America
- Workers Party of North Korea
- Workers Party of South Korea
- Workers Party of the United States
- Workers Solidarity Movement
- Workers World Party
- Workers of the world, unite!
- Working class
- Workingmen's Party of New York
- Workingmen's Party of the United States
- World Federation of Democratic Youth
- World revolution
- World Social Forum
- World Socialist Movement
- World revolution
- Yakut Autonomous Soviet Socialist Republic
- Yemeni Socialist Party
- Young Communist International
- Young Communist League (Cuba)
- Young People's Socialist League
- Young Pioneer organization of the Soviet Union
- Zapatista Army of National Liberation
- Étienne Cabet
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