The following categories exist on the wiki, and may or may not be unused. Also see wanted categories.
- Library works by Marx (0 members)
- Library works by Maxim Gorky (2 members)
- Library works by Michael Parenti (30 members)
- Library works by Moissaye Joseph Olgin (1 member)
- Library works by Muammar Gaddafi (3 members)
- Library works by Nia Frome (9 members)
- Library works by Nick Estes (2 members)
- Library works by Nicolo Machiavelli (1 member)
- Library works by Phil Ochs (18 members)
- Library works by Progress Publishers (1 member)
- Library works by Richard Levins (1 member)
- Library works by Richard Lewontin (1 member)
- Library works by Rosa Luxemburg (2 members)
- Library works by Samir Amin (1 member)
- Library works by Stalin (0 members)
- Library works by Sun Tzu (1 member)
- Library works by Sven-Eric Holmström (1 member)
- Library works by Thomas Paine (1 member)
- Library works by Thomas Sankara (5 members)
- Library works by Vijay Prashad (3 members)