Columbia subject headings:
Communism--France.
Communism--Soviet Union.
Parti communiste français.
Harvard subject headings:
Communism--France--History
Communism--Soviet Union--History
Labor unions and communism--France--History.
Labor unions and communism--Soviet Union--History.
Princeton subject headings:
Communism--France--History.
Communism--Soviet Union--History.
Labor unions and communism--France--History.
Labor unions and communism--Soviet Union--History.