The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Letters by Karl Marx (1 member)
- Liberalism (2 members)
- Liberals (8 members)
- Libertarianism (4 members)
- Library (30 members)
- Library documents from Albania (2 members)
- Library documents from Brazil (1 member)
- Library documents from China (26 members)
- Library documents from India (0 members)
- Library documents from Laos (2 members)
- Library documents from Mongolia (1 member)
- Library documents from Palestine (3 members)
- 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 (7 members)
- Library documents from the United States of America (9 members)
- Library science (1 member)
- Library works (1 member)
- Library works about Canada (1 member)
- Library works about China (17 members)
- Library works about Cuba (6 members)
- Library works about Czechoslovakia (1 member)
- 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 (29 members)
- Library works about Juche (2 members)
- Library works about LGBT+ (4 members)
- Library works about LGBTQ+ (0 members)
- Library works about Laos (1 member)
- Library works about Liberalism (1 member)
- Library works about Maurice O'Neill (5 members)
- Library works about Military theory (0 members)
- Library works about Palestine (8 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 (20 members)