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 of mainly anti-Semitic material was compiled by a Jewish librarian of German descent who infiltrated the pro-Nazi community developing in New York City in the years leading up to World War II. The bulk of the collection consists of publications and printed matter, with the notable exception of narrative reports that describe first-hand experiences and observations of Nazi-affiliated events. Document types include advertisements, event announcements, books, clippings, correspondence, magazines and newspapers, travel guides, political memorabilia, and other print ephemera.

Morris U. Schappes, self-taught historian of American Jewish History, author, teacher, and editor of Jewish Currents for 40 years, is also known as a victim of hearings conducted in 1941 by the Rapp-Coudert Committee, a New York legislative committee investigating Communist activities in the state educational system.

This collection is comprised of materials related to the Rapp-Coudert proceedings and Schappes' subsequent imprisonment, and of materials generated in the following decades. Topics represented include academic freedom, Communism in the U.S., the roles of Jews in U.S. history, and Emma Lazarus. The formats primarily present in the collection are research notes, manuscripts, clippings, and correspondence.

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.

The Jewish People’s Chorus of Los Angeles was a chorus associated with the Jewish Music Alliance, an organization meant to promote Yiddish folk and revolutionary music, founded by Jacob Schaefer in 1925. This collection contains manuscripts of music performed by the chorus as well as a few performance notes.