Columbia subject headings:
Political purges--Soviet Union--History.
Soviet Union--Politics and government--1936-1953.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--History.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--Purges--History.
Stalin, Joseph, 1878-1953.
Harvard subject headings:
Political purges--Soviet Union--History--20th century.
Soviet Union--Politics and government--1936-1953.
Soviet Union. Narodnyĭ komissariat vnutrennikh del--History.
Stalin, Joseph, 1878-1953
Princeton subject headings:
Soviet Union. Narodnyĭ komissariat vnutrennikh del--History.