Brief Description: Correspondence with Yiddish literary figures and with organizations. Correspondents include A. Almi, Ephraim Auerbach, Shlomo Bickel, Menahem Boraisha, Ossip Dymow, Jacob Glanz, Aaron Glanz-Leieles, Jacob Glatstein, Abraham Golomb, Chaim Grade, Peretz Hirschbein, David Ignatoff, Rachel Korn, H. Leivick, Itzik Manger, Mani Leib, Moshe Nadir, Shmuel Niger, Joseph Opatoshu, Abbo Ostrowsky, Melech Ravitch, A.A. Roback, Isaac Bashevis Singer, Abraham Sutzkever, Malka Heifetz Tussman, Zishe Weinper. Family correspondence. Correspondence of the Yiddish P.E.N. Club and the I.L. Peretz Yiddish Writers Union. Clippings, circulars and correspondence about the World Conference of Yiddish Writers, 1964. Lists of Yiddish P.E.N. Club members. Clippings: articles about writers, about Leon Feinberg, and his works. Clippings about various topics collected by Feinberg for reference. Topics include Yiddish language, Yiddish writers, Yiddish literature, Jews in the Soviet Union, Russian Jewish Writers. Manuscripts of Feinberg's works: poems, translations, plays, fragments of novels. Manuscripts of other writers: Ossip Dymow, Mani Leib, A. Mukdoni, Moshe Nadir, Boruch Rivkin. Speeches and lectures. Personal documents.