The records of the American Jewish Congress, a national Jewish agency, concerned primarily with Jewish and other minority civil rights, include the constitution, by-laws, and minutes of the Administrative and Executive Committees and Governing Council of the Congress. The collection has materials generated by the National Biennial Conventions, Executive Directors, including Phil Baum and Henry Siegman, and the General Counsel files of Will Maslow, Commissions and the Jerusalem Conferences of Mayors, Regional Chapters, National Women's Division, Business and Professional Chapters, Public Relations, and miscellaneous activities conducted by American Jewish Congress.

Julius Caesar Claude Edelstein (1912-2005), served as advisor and executive assistant to military officials and political figures. His papers primarily encompass his job as executive assistant and chief of legislative staff to Senator Herbert H. Lehman during Lehman's senatorial years 1949-1956. Edelstein remained executive assistant to former senator Lehman from 1957-1960. His files include correspondence, memoranda, press releases, clippings, speeches, statistics, maps, pamphlets and government publications.Julius Caesar Claude Edelstein (1912-2005), served as advisor and executive assistant to military officials and political figures. His papers primarily encompass his job as executive assistant and chief of legislative staff to Senator Herbert H. Lehman during Lehman's senatorial years 1949-1956. Edelstein remained executive assistant to former senator Lehman from 1957-1960. His files include correspondence, memoranda, press releases, clippings, speeches, statistics, maps, pamphlets and government publications..

This collection contains correspondence and literary manuscripts of Louis Alexander Freedman (1873-1957).

Markov's papers consist of correspondence, a brief biography (apparently by his nephew), and printed materials. Correspondence in this collection consists of letters to a nephew named Seva. Printed materials include issues of "Mirovai︠a︡ Sluzhba" (1936-38), and two books by Markov: "Voĭny temnykh sil" (Paris, 1928), and "Otrechennye dni fevralśkoĭ revoli︠u︡t︠s︡ii 1917 goda" (Harbin, 1938).

Professional and personal papers of the German émigré scholar Paul Oskar Kristeller. Kristeller was a professor of philosophy at Columbia University and a world renowned scholar of Renaissance humanism and Renaissance philosophy who published widely, notably his major catalog of uncataloged manuscripts from the Italian Renaissance, the Iter Italicum.

Most of the collection concerns the Cossacks in the emigration in the 1920s. Correspondents include Petr Krasnov, Aleksandr Lukomskiĭ, Afrikan Bogaevskiĭ, and Grand Duke Nikolaĭ Nikolaevich. There are White intelligence reports from the Civil War in the south, and manuscripts, correspondence, and mimeographed bulletins relating to the Cossacks in Europe in the 1920s. Printed materials consist of anti-Semitic Russian publications, including issues of "Nat︠s︡ii︠a︡" and "Zhidoved" from the 1930s.

This collection documents the work of the Non-Sectarian Anti-Nazi League to Champion Human Rights, a group originally founded in 1933 to coordinate boycotts against Nazi Germany. It later investigated and reported on extremist and hate groups of many kinds, primarily within the United States.

This collection contains an eclectic variety of materials collected by Jewish historian, archivist, and bibliographer Zosa Szajkowski (1911-1978). Materials include organizational records, documents, correspondence, periodicals, printed ephemera related to Eastern European Jewish life in France in 1920s and 1930s and on the territories of modern Ukraine, Lithuania, Poland and Russia in the first quarter of the 20th century.