Columbia subject headings:
Communism--Soviet Union--History.
Communist International.
Soviet Union--History--Revolution, 1917-1921.
Harvard subject headings:
Communism--Russia--History.
Communist International
Soviet Union--History--Revolution, 1917-1921.
Princeton subject headings:
Communism--Russia--History.
Communist International.
Soviet Union--History--Revolution, 1917-1921.