Brief Description: Correspondence with Einhorn's wife.  Correspondence with Jewish and international socialist leaders: Victor Alter,  Angelica Balabanoff, Abraham Cahan, Henryk Erlich, Vladimir Medem, Baruch Vladeck.      Correspondence with writers and journalists: Shalom Asch, Isaak Babel, Martin Buber, Simon Horontchik, Abraham Liessin, Shmuel Niger, Joseph Opatoshu, Zalman Shneur, I.J. Singer, Yehoash. Correspondence with Yiddish publications.

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