Samuel A. Portnoy (Portnoy, Samuel A.)

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  Henryk Erlich and Victor Alter: Two Heroes and Martyrs for Jewish Socialism
  by Samuel A. Portnoy
  Hardcover, Ktav Pub Inc, ISBN 088125357X (0-88125-357-X)
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  Vladimir Medem: The Life and Soul of a Legendary Jewish Socialist
  by Samuel A. Portnoy
  Hardcover, Ktav Pub Inc, ISBN 0870683322 (0-87068-332-2)