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 collections contains reports, study materials, and publications regarding Line of March, a trend within the Marxist-Leninist anti-revisionist rectification movement that was centered around the Line of March journal.

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).

This collection includes the personal and professional papers of Berta Green Langston, an active member of the Socialist Workers Party and Socialist Action who was involved in various protest movements during the 20th century. It includes newsletters, newspaper articles, miscellaneous writings, and correspondence with James Baldwin, Robert F. Williams, Albert Perry, Dave Dellinger, William Worthy, Pete Seeger, and Noam Chomsky, among others.