Columbia subject headings:
Harvard subject headings:
Forced labor--Soviet Union--History
Internment camps--Soviet Union--History
Labor camps--Soviet Union--History.
Political prisoners--Soviet Union--History.
Soviet Union--History--1925-1953.
Soviet Union--History--1953-1985.
Soviet Union. Narodnyĭ komissariat vnutrennikh del
Princeton subject headings:
Forced labor--Soviet Union--History.
Internment camps--Soviet Union--History.
Labor camps--Soviet Union--History.
Political prisoners--Soviet Union--History.
Soviet Union--History--1925-1953.
Soviet Union--History--1953-1985.
Soviet Union. Narodnyĭ komissariat vnutrennikh del