Columbia subject headings:
Communism.
Soviet Union--Politics and government--1917-1936.
Soviet Union--Politics and government--1936-1953.
Stalin, Joseph, 1878-1953.
Trotsky, Leon, 1879-1940.
Harvard subject headings:
Princeton subject headings:
Intellectuals--Soviet Union--Biography.
Political purges--Soviet Union.
Soviet Union--Politics and government--1936-1953.