The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Anti-semitic propaganda (0 members)
- Anti-war activists (3 members)
- Anti-war books (2 members)
- Anti-war media (1 member)
- Anti-war movement (4 members)
- Antipsychiatry (1 member)
- Antisemitic propaganda (4 members)
- Antisemitism (6 members)
- Apartheid states (3 members)
- Architecture (1 member)
- Art (8 members)
- Art movements (2 members)
- Articles about library works (1 member)
- Articles containing a deprecated citing method (27 members)
- Articles containing information from Wikipedia (8 members)
- Articles needing cleaning up (45 members)
- Articles needing translation (0 members)
- Articles which use infobox templates with no data rows (4 members)
- Articles with disputed statements (1 member)
- Articles with unsourced statements (1 member)
- Asia country and territory topics templates (1 member)
- Asian countries (50 members)
- Assassins (1 member)
- Atlanticism (1 member)
- Atrocities committed by the United States (1 member)
- Attempted Colour Revolutions (4 members)
- Australian journalists (1 member)
- Austrian economists (1 member)
- Austro-Hungarian military personnel of World War I (1 member)
- Author: Vladimir Lenin (0 members)
- Autonomous regions in China (4 members)
- Ba'athist states (1 member)
- Banned editors (0 members)
- Bar charts (5 members)
- Bar graphs (0 members)
- Basic Marxism–Leninism study plan by r/communism (20 members)
- Belarus (1 member)
- Belt and Road Initiative (2 members)
- Big tech (6 members)
- Bigotry (5 members)
- Billionaires (6 members)
- Biologists (7 members)
- Black Panther Party (6 members)
- Black left feminism (2 members)
- Black nationalism (9 members)
- Black nationalists (2 members)
- Black people murdered by US police (2 members)
- Blocked editors (13 members)
- Bolsheviks (8 members)
- Book covers (1 member)