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 comprises subject files related to or published by socialist and communist youth organizations including Young People's Socialist League; Internationalist Socialist Youth; Young Communist International; Young Communist League; and American Student Union. It includes leaflets; resolutions; bulletins; pamphlets; reports; bulletins; and one song book.