Columbia subject headings:
Political atrocities--Soviet Union--History.
Political persecution--Soviet Union--History.
Political purges--Soviet Union--History.
Soviet Union--Politics and government--1917-1936.
Soviet Union--Politics and government--1936-1953.
Stalin, Joseph, 1878-1953.
Harvard subject headings:
Political persecution--Soviet Union.
Soviet Union--Politics and government--1917-1936.
Soviet Union--Politics and government--1936-1953.
Princeton subject headings:
Political atrocities--Soviet Union--History.
Political persecution--Soviet Union--History.
Stalin, Joseph, 1878-1953.