The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Former socialist republics (6 members)
- Former socialist states (19 members)
- Formerly fascist countries (7 members)
- Formerly socialist countries (5 members)
- Founding Fathers of the United States (6 members)
- France (1 member)
- Free Peru politicians (1 member)
- Free and open-source software (4 members)
- French philosophers (2 members)
- Friedrich Engels (1 member)
- Furturist movements (2 members)
- Futurism (1 member)
- Futurist movements (0 members)
- Futurology (1 member)
- GDR propaganda posters (2 members)
- General elections (2 members)
- General strikes (2 members)
- Generals (2 members)
- Genocide (13 members)
- Genocide perpetrators (15 members)
- Geopolitics (9 members)
- German-American Forty-Eighters (1 member)
- German Democratic Republic (2 members)
- German communists (10 members)
- German philosophers (9 members)
- Germans by descent (2 members)
- Germans of Dutch descent (1 member)
- Germans of Swiss descent (1 member)
- Gig economy (3 members)
- Global north (35 members)
- Global south (60 members)
- Government of the United States of America (14 members)
- Governors of Delaware (1 member)
- Governors of Kentucky (1 member)
- Governors of Virginia (1 member)
- Graphs (0 members)
- Grenada (10 members)
- Guerilla warfare (1 member)
- Gulag (0 members)
- Hammer and sickle (1 member)
- Hashtags (1 member)
- Hawaii templates (1 member)
- Heads of government (3 members)
- Heads of state (4 members)
- Hegelianism (3 members)
- Help pages (2 members)
- Heroes of the Soviet Union (3 members)
- Hidden categories (4 members)
- Higher education (2 members)
- Historians (3 members)
- Historical maps (1 member)
- Historical materialism (5 members)
- History (13 members)
- History (essays) (0 members)
- History by country (14 members)
- History of Austria (2 members)
- History of China (13 members)
- History of Cuba (1 member)
- History of England (2 members)
- History of France (1 member)
- History of Germany (7 members)
- History of Hungary (1 member)
- History of India (4 members)
- History of Ireland (1 member)
- History of Japan (5 members)
- History of Korea (4 members)
- History of Palestine (1 member)
- History of Poland (3 members)
- History of Russia (12 members)
- History of Spain (4 members)
- History of Ukraine (3 members)
- History of Vietnam (3 members)
- History of Xi'an (1 member)
- History of labor relations in the United States (2 members)
- History of the Soviet Union (8 members)
- History of the UK (1 member)
- History of the USA (14 members)
- History portals (3 members)
- Ho Chi Minh (2 members)
- Holidays (3 members)
- How tos (essays) (5 members)
- Hoxhaism (10 members)
- Hoxhaist organisations (5 members)
- Hungarian anti-fascists (1 member)
- Hungarian communists (1 member)
- I Ain't Marching Anymore (4 members)
- Idealism (11 members)
- Ideological conflicts (1 member)
- Ideological infrastructure (26 members)
- Ideology of the Communist Party of China (6 members)
- Ideology of the Communist Party of the Soviet Union (1 member)
- Ideology of the Democratic People's Republic of Korea (1 member)
- If I Had a Hammer: Songs of Hope and Struggle (1 member)
- Illegal states (5 members)
- Images (13 members)
- Imperial Russian Army personnel (1 member)
- Imperialism (19 members)
- Imperialist companies (18 members)
- Imperialist countries (27 members)
- Imperialist intergovernmental organizations (9 members)
- Imperialist organizations (20 members)
- Imperialist political parties (12 members)
- Imperialist propaganda (28 members)
- Imperialist secret police (11 members)
- Imperialist think tanks (3 members)
- Imperialist treaties (1 member)
- Imperialist wars (1 member)
- Imperialists (19 members)
- Incomplete (0 members)
- Incomplete library works (10 members)
- Indian Marxists (7 members)
- Indian revolutionaries (1 member)
- Indigenous People of the Americas (2 members)
- Indigenous leaders (2 members)
- Industrial Workers of the World (1 member)
- Industrial policies (1 member)
- Infoboxes without native name language parameter (8 members)
- Informational essays (2 members)
- Infrastructure projects (1 member)
- Instruments of the bourgeoisie (3 members)
- Insurgencies (1 member)
- Intelligence Operations (9 members)
- Intelligence agencies (2 members)
- Intelligence operations (1 member)
- Intergovernmental organizations (15 members)
- International Auxiliary Languages (0 members)
- International Communist Organisations (0 members)
- International auxiliary languages (2 members)
- International communist organizations (10 members)
- International socialist organizations (1 member)
- Interviews (10 members)
- Iran (2 members)
- Iran memes (1 member)
- Iranian state media (1 member)
- Irish Marxists (2 members)
- Irish republicans (3 members)
- Irish socialists (2 members)
- Irish trade unionists (2 members)
- Islam (7 members)
- Japan (5 members)
- Jihadism (3 members)
- Joseph Stalin (9 members)
- Journalism (3 members)
- Journalists (19 members)
- Journalists by country (3 members)
- Juche (2 members)
- Jucheists (11 members)
- Judaism (1 member)
- Julius Nyerere (2 members)
- KKE comrades (0 members)
- Karl Marx (3 members)
- Khmer Rouge Atrocities (1 member)
- LGBT+ (5 members)
- LGBT+ people (3 members)
- LGBT+ topics (essays) (1 member)
- Labor (3 members)
- Labor movement (4 members)
- Labor movement by country (1 member)
- Labor movement in the United States (7 members)
- Labor organizers (3 members)
- Labor strikes (10 members)
- Labor strikes by country (1 member)
- Labor strikes by year (2 members)
- Labor strikes in 2021 (3 members)
- Labor strikes in 2022 (1 member)
- Labor strikes in the United States (5 members)
- Langston Hughes (1 member)
- Language (6 members)
- Laotian leaders (3 members)
- Latin American countries (15 members)
- Law enforcement (2 members)
- Leaders (9 members)
- Leaders by country (1 member)
- Leaders of political parties (1 member)
- Left-wing ideologies (28 members)
- Left communism (4 members)
- Left communists (2 members)
- Leftist music (5 members)
- Lemmygrad Community (1 member)
- Leninism (9 members)
- Letters between Marx and Engels (1 member)
- Liberalism (2 members)
- Liberals (8 members)
- Libertarianism (4 members)
- Library (31 members)
- Library documents from Albania (2 members)
- Library documents from Brazil (1 member)
- Library documents from China (22 members)
- Library documents from India (0 members)
- Library documents from Laos (2 members)
- Library documents from Mongolia (1 member)
- Library documents from Palestine (1 member)
- Library documents from Russia (1 member)
- Library documents from Vietnam (3 members)
- Library documents from the Brazilian Communist Party (4 members)
- Library documents from the CPUSA (2 members)
- Library documents from the DPRK (6 members)
- Library documents from the DRPK (0 members)
- Library documents from the Soviet Union (6 members)
- Library documents from the United States of America (8 members)
- Library science (1 member)
- Library works (1 member)
- Library works about Canada (1 member)
- Library works about China (15 members)
- Library works about Cuba (6 members)
- Library works about Decolonisation (0 members)
- Library works about Economics (0 members)
- Library works about Feminism (0 members)
- Library works about Feudalism (0 members)
- Library works about Geopolitics (0 members)
- Library works about India (1 member)
- Library works about Ireland (13 members)
- Library works about Juche (2 members)
- Library works about LGBT+ (3 members)
- Library works about LGBTQ+ (0 members)
- Library works about Laos (1 member)
- Library works about Liberalism (1 member)
- Library works about Military theory (0 members)
- Library works about Palestine (7 members)
- Library works about Peru (1 member)
- Library works about Philosophy (0 members)
- Library works about Soviet foreign policy (1 member)
- Library works about Stalin (5 members)
- Library works about Venezuela (1 member)
- Library works about Vietnam (2 members)
- Library works about Yugoslavia (1 member)
- Library works about anti-communist economists (0 members)
- Library works about decolonisation (16 members)
- Library works about economics (8 members)
- Library works about fascism (5 members)
- Library works about feminism (10 members)
- Library works about geopolitics (6 members)
- Library works about history (1 member)
- Library works about imperialism (22 members)
- Library works about military theory (9 members)
- Library works about philosophy (13 members)
- Library works about religion (1 member)
- Library works about revisionism (11 members)
- Library works about revisionist tendencies (0 members)
- Library works about science (6 members)
- Library works about the 2022 Russo-Ukrainian conflict (1 member)
- Library works about the DPRK (7 members)
- Library works about the GDR (2 members)
- Library works about the Moscow trials (1 member)
- Library works about the Soviet Union (20 members)
- Library works about the United States of America (10 members)
- Library works about the interwar period (1 member)
- Library works about the meat industry (1 member)
- Library works about veganism (1 member)
- Library works by Albert Einstein (1 member)