This collection includes material collected by Lyle Fulks, a member of the Socialist Workers Party and Solidarity. It includes material from other Socialist organizations, such as Workers Power, Socialist Action, and International Socialist. Besides material related to Socialist organizations, the collection also includes teaching syllabi, articles, personal material, and other subjects related to Socialism, Communism, Marxism, labor, and social justice.

The collection comprises the papers of Asher Harer, a member of the Socialist Workers Party and Socialist Action, as well as a trade unionist and anti-Vietnam War activist. It includes correspondence, photographs, reports, resolutions, minutes, notes, study guides, flyers, newsletters, leaflets, newspapers and newspaper clippings, and scrapbooks.

This collection contains pamphlets, manuscripts, correspondence, and ephemera related to labor movements and issues, Anarchism, Communism, Marxism, Socialism, Trotskyism, civil rights, anti-war and peace movements, the Soviet Union and the Russian Revolution, and related subjects in the arts, sciences, religion, sports, economics, education, and government.

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

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

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 convention documents and discussion bulletins regarding the League for Socialist Action/ Ligue Socialiste Ouvrière (LSA/LSO), a Canadian Trotskyist organization.

This collection contains two boxes of publications related to Militant Labour and Socialist Party issues in the later half of the twentieth century. The majority of the publications are based on issues in the labor movement in England and are published in England or Wales.