Columbia subject headings:
Anti-communist movements--Soviet Union--History--Sources.
Soviet Union--Politics and government--Sources.
Working class--Soviet Union--History--Sources.
Harvard subject headings:
Anti-communist movements--Soviet Union--History--Sources.
Labor--Soviet Union--History--Sources.
Soviet Union--Politics and government--Sources.
Working class--Soviet Union--History--Sources.
Princeton subject headings:
Anti-communist movements--Soviet Union.
Soviet Union--Politics and government--Sources.
Working class--Soviet Union--History--Sources.