Columbia subject headings:
Political atrocities--Soviet Union.
Political persecution--Soviet Union.
Soviet Union--History--1925-1953.
Harvard subject headings:
Political atrocities--Soviet Union.
Political persecution--Soviet Union.
Soviet Union--History--1925-1953.
Princeton subject headings:
Political atrocities--Soviet Union.
Political persecution--Soviet Union.
Soviet Union--History--1925-1953.