Title: Na sluzhbi︠e︡ Cheka i Kominterna
Subjects: Soviet Espionage, Russian S.F.S.R. Chrezvychaĭnai︠a︡ komissii︠a︡ po borʹbe s kontr-revoli︠u︡t︠s︡ieĭ i sabotazhem, Soviet Union. Obʺedinennoe gosudarstvennoe politicheskoe upravlenie