Columbia subject headings:
Philosophy, Marxist.
Socialism--Soviet Union--Philosophy.
Socialists--Soviet Union--History--20th century.
Harvard subject headings:
Philosophy, Marxist.
Socialism--Soviet Union--Philosophy.
Socialists--Soviet Union--History--20th century.
Princeton subject headings:
Communism--Russia--History.
Communism--Soviet Union--Study and teaching.
Philosophy, Marxist--Russia--History.
Philosophy, Marxist--Study and teaching--Soviet Union.