Columbia subject headings:
Prisons--Soviet Union.
Soviet Union. Obʺedinennoe gosudarstvennoe politicheskoe upravlenie.
Harvard subject headings:
Prisons--Soviet Union
Soviet Union. Obʺedinennoe gosudarstvennoe politicheskoe upravlenie
Princeton subject headings:
Prisons--Soviet Union.
Russia (1923- U.S.S.R.) Obe̋dīnennoe gosudarstvennoe polītīcheskoe upravienīe.