This collection contains research material and information on the life of Max Kreutzberger, a former Director of the Leo Baeck Institute (LBI) in New York. A large portion of this collection consists of copies of documents from archives in Europe, Israel, and the United States. There is also information on the Leo Baeck Institute in general, LBI events, and LBI publications. In addition, the collection holds Max Kreutzberger's correspondence, writings, and some personal papers.

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consists of the general, personal and professional correspondence of Moses Kligsberg, manuscripts for published and unpublished works, project proposals and outlines, research materials, printed matter and other records relating to Moses Kligsberg's involvement with the Bund and with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 historian and bibliographer Philip Friedman. These materials include correspondence with individuals and with organizations, newspaper clippings, subject files, manuscripts of works by Friedman and by others, and some of Friedman’s personal documents. These materials relate to Friedman’s work on the histories of various Jewish communities, particularly those in Poland, and his work gathering source documents about the Holocaust.

This collection contains the personal and professional papers of Shmuel Mordkhe Zygielbojm, a Jewish-Polish Socialist politician, Bund leader, member of the National Council of the Polish Government-in-Exile in London, and a labor and political leader. These materials include Zygielbojm’s writings, personal correspondence, clippings, and some photographs. These materials relate mainly to Zygielbojm’s work in London as well as the worldwide reactions after his suicide.

Raphael Lemkin, an international lawyer, initiated the use of the term "genocide," and succeeded in persuading the United Nations to adopt the Genocide Convention in 1948. Documents include personal correspondence and artifacts; correspondence, documentation, clippings, and articles regarding the United Nations adoption of the Convention on the Prevention and Punishment on the Crime of Genocide treaty; and source material for the unfinished manuscript, History of Genocide. Collection also includes photographs, identity cards, articles, papers, essays, clippings, magazines, research materials, term papers, posters, United Nations materials, and microfilm.

The Territorial Collection, Poland 2 is comprised of documents that were amassed at the YIVO in New York City. The collection is of mixed provenance and is fragmentary in nature, consisting of miscellaneous materials dating back to World War II and its immediate aftermath. The Territorial Collection Poland 2 is a portion of the greater Territorial Collection (RG 116), which incorporates materials that are relevant to over 42 different countries and geographical regions. The overarching theme of the collection Poland 2 is the annihilation of the Jewish life in Poland under the Nazi rule. Chronologically, the Territorial Collection Poland 2 follows the Territorial Collection Poland 1, which pertains to pre-World War II Poland; and precedes the Territorial Collection Poland 3, which pertains to post-World War II Poland.