Columbia subject headings:
Internment camps--Soviet Union.
Nazi concentration camps--Soviet Union.
Political prisoners--Soviet Union.
Prisoners--Soviet Union.
Soviet Union--Politics and government--1917-1936.
Harvard subject headings:
Internment camps--Soviet Union
Political prisoners--Soviet Union.
Prisons--Soviet Union
Princeton subject headings:
Internment camps--Soviet Union.
Political prisoners--Soviet Union.
Prisoners--Soviet Union.
Soviet Union--Politics and government.