Columbia subject headings:
Harvard subject headings:
Communism--Soviet Union--History
Political purges--Soviet Union--History--20th century.
Soviet Union--Politics and government.
Stalin, Joseph, 1878-1953
Stalin, Joseph, 1878-1953.
Princeton subject headings:
Communism--Soviet Union--History--20th century.
Political purges--Soviet Union--History--20th century.
Soviet Union--Politics and government.
Stalin, Joseph, 1878-1953.