Primarily material related to Schneiderman's role as California State Secretary of the Communist Party, including correspondence, leaflets, clippings, pamphlets, memoranda, reports, hearing transcripts and manuscript for his autobiography, Dissent on Trial , including one chapter not published.

The Loretta Starvus Stack collection consists of letters, cards and drawings sent by Smith Act defendant, Loretta Stack, to her husband, Walter Stack, and children, as well as those she received from family and friends while she was detained in the Los Angeles County Jail from August to December of 1951, and during her trial in Los Angeles in 1952 (Yates, et. al v. United States Government).