Columbia subject headings:
Communism--Soviet Union--History--20th century.
Political parties--Soviet Union--History--20th century.
Soviet Union--Politics and government.
Harvard subject headings:
Communism--Soviet Union--History
Political parties--Soviet Union--History--20th century.
Soviet Union--Politics and government.
Princeton subject headings:
Communism--Soviet Union--History--20th century.
Political parties--Soviet Union--History--20th century.
Soviet Union--Politics and government.