The collection contains the papers of Meryl and Manny Sunshine, socialist activists who were members of the Freedom Socialist Party, Radical Women, the Committee for a Revolutionary Socialist Party, the Peace and Freedom Party, and other organizations. It includes subject files, convention and conference materials, leaflets, photographs, bulletins, reports, memoranda, press releases, minutes, publications, election materials, and draft proposals.

The collection comprises issues of the internal bulletin of the Johnson-Forest Tendency, a Marxist-Humanist tendency within the Workers Party and the Socialist Workers Party (SWP) led by C.L.R. James, Raya Dunayevskaya, and Grace Lee Boggs.

The collection contains bulletins and reports by International Socialists, a third camp Trotskyist organization in the United States.

The collection contains pamphlets and bulletins published by the International Bolshevik Tendency (IBT), a Trotskyist organization.

The Rod Holt subject file collection, 1959-1997, bulk 1987-1998, contains files on various political and scientific subjects that were created and maintained by Rod Holt, who was Apple employee #5 as well as a socialist, political activist, and the founder of the Holt Labor Library in San Francisco, California. It contains newspaper clippings and photocopies, correspondence, notes, flyers, leaflets, notices, one audiocassette, one floppy disk, and other materials.

The collection contains minutes, discussion bulletins, agendas, notes, audiocassettes, subject files, a draft resolution, and one commercial lease document that reflect the founding and administration of the Socialist Workers Organization (SWO) from 2001-2004. The SWO is a Trotskyist political organization that was founded by expelled members of Socialist Action in 1999.

The collection comprises bulletins, convention and forum constitutions, programs, and leaflets, correspondence, reports, flyers, and subject files relating to the Socialist Workers Party (SWP), which was founded in 1928 by James P. Cannon.

The collection contains Internal Discussion Bulletins and Pre-Conference Discussion Bulletins published by Revolutionary Communist Youth (RCY), and Internal Discussion Bulletins and one Young Communist League Bulletin published by the Spartacus Youth League (SYL). Both organizations served as the national youth group for the Spartacist League of the U.S., a Trotskyist political organization, from 1971-1986.

This collection contains bulletins, pamphlets, articles, and one conference transcript that reflect the theoretical sentiments and organizational activities of the Spartacist League of the U.S. The League was officially formed in 1966 by expelled members of the Revolutionary Tendency within the Socialist Workers Party. It is the United States section of the International Communist League (Fourth International).

The collection contains correspondence, reports, draft resolutions, bulletins, minutes, plenum and convention documents, and subject files related to Socialist Action, a Trotskyist political organization.