This collection contains materials collected by David Trotsky relating to the Jewish community of Belgium in the inter-war period. Materials include printed documents, posters, reports, meeting minutes, and newspaper clippings, mainly pertaining to the Jews of Brussels and Antwerp.

This collection contains documents relating to Isaac A. Hourwich’s role as an economist, publicist, statistician, lawyer, author, and authority on immigration, as well as his involvement with the labor movement and the formation of the American Jewish Congress. There are reports, minutes of meetings, memoranda, clippings and correspondence, and manuscripts and articles about Jewish labor, Socialism, Russia, Marxism, immigration, and other subjects. These materials demonstrate Hourwich’s important role in American labor, immigration theory, and political and economic theory.

This collection contains documents of journalist and left-wing political activist Paul Novick, consisting mainly of correspondence, subject files, manuscripts, photographs, and newspaper clippings. These materials relate to Novick’s career as long-time editor of the Morning Freiheit (Morning Freedom), his important role in the worldwide Communist movement, the history of the Freiheit itself, and Jewish and general politics. These materials demonstrate Novick’s important, and changing, role in the history of Communism, as well as his career as a Yiddish journalist and author.

This collection comprises trial transcripts and related documents pertaining to trials conducted by the Board of Higher Education in 1941 to 1942, in the cases of 20 faculty and staff members of City College and Brooklyn College. The charges, mostly relating to Communist Party membership and activities, were brought by the Board's Conduct Committee, based on allegations raised in investigative hearings held in 1941 by the Joint Legislative Committee to Investigate the Educational System of the State of New York, a committee of the New York State Legislature commonly known as the Rapp-Coudert Committee. In addition, the collection includes a small amount of material documenting the work of the New York City Board of Education's Integration Commission in 1956 to 1957.