Columbia subject headings:
Communism and society.
Communism.
Soviet Union--History--Revolution, 1917-1921--Influence.
Harvard subject headings:
Communism and society.
Communism.
Soviet Union--History--Revolution, 1917-1921--Influence.
Princeton subject headings:
Communism and society.
Communism.
Soviet Union--History--Revolution, 1917-1921--Influence.