Unity, solidarity, internationalism : international Communist unity, historical experience, principles and problems / B.M. Leibzon ; [translated from the Russian by Galina Sdobnikova]. Leĭbzon, B. M. (Boris Moiseevich), 1906- Communism. Internationalism. Nationalism and communism. HX40 .L38538 1981 320.532 19 LEU Includes bibliographical references. Moscow : Progress, c1981. c1981. 1981 Text 375 p. ; eng engrus