The collection consists of the general, personal and professional correspondence of Moses Kligsberg, manuscripts for published and unpublished works, project proposals and outlines, research materials, printed matter and other records relating to Moses Kligsberg's involvement with the Bund and with Jewish refugees from Nazi-occupied Europe, to his functions at the YIVO Institute for Jewish Research, and to his scholarly interests. Included are Moses Kligsberg's manuscripts on the subjects of Jewish sociology, psychology, youth, and political matters. The collection contains a great deal of YIVO administrative and publicity materials, among others editorial records of the Yedies fun yivo (YIVO News) and YIVO radio programs; materials on the Bund; records of the United Jewish Survivors of Nazi Persecution. Besides the personal documents and both personal and organizational correspondence, the collection also includes original musical compositions, acetate recordings, magnetic reels, and photographs.

This collection contains the personal and professional papers of William Edlin, editor of The Day and a prominent Socialist. It includes correspondence with individuals and with organizations, newspaper clippings, manuscripts of works by Edlin and by others as well as translations done by Edlin, and some of Edlin’s personal documents. These materials relate to Edlin’s involvement with The Day, with the Socialist Party, the Workmen’s Circle, various labor and Zionist organizations, literary clubs and activities, and with music, art and drama.

This collection contains records of the Zukunft monthly journal, which was devoted to publishing political, scientific and literary articles in Yiddish. It contains newspaper clippings, correspondence, meeting minutes, materials relating to conferences and anniversary issues, financial reports, programs, mailings, subscription materials, and typed and handwritten manuscripts submitted for publication.