Columbia subject headings:
Harvard subject headings:
Espionage, Soviet--History
Internal security--Soviet Union--History
Political persecution--Soviet Union--History
Russian S.F.S.R. Chrezvychaĭnai︠a︡ komissii︠a︡ po borʹbe s kontr-revoli︠u︡t︠s︡ieĭ i sabotazhem
Soviet Union. Obʺedinennoe gosudarstvennoe politicheskoe upravlenie
Princeton subject headings:
Russian S.F.S.R. Chrezvychaĭnai︠a︡ komissii︠a︡ po borʹbe s kontr-revoli︠u︡t︠s︡ieĭ i sabotazhem
Soviet Union. Obʺedinennoe gosudarstvennoe politicheskoe upravlenie