Abstract: Papers of Halstead, a Socialist Workers Party presidential candidate and leading opponent of U.S. involvement in the War in Vietnam. The collection consists of correspondence and research files for his book Out Now: A Participant's Account of the American Movement Against the Vietnam War (1978) and records of various anti-war organizations, most notably the Fifth Avenue Vietnam Peace Parade Committee, New Mobilization Committee to End the War in Vietnam, National Peace Action Coalition (NPAC), National Committee for a Sane Nuclear Policy (SANE), and the Student Mobilization Committee (SMC). Also included are subject files containing publicity material, press releases, correspondence, agendas and proposals for individual conferences, demonstrations, and GI civil liberties. In addition there is a tape recording of an oral history interview given by Halstead about the origins of the anti-war movement and photographs of protests.