Columbia subject headings:
Harvard subject headings:
Soviet Union--History--Revolution, 1917-1921--Biography.
Soviet Union--History--Revolution, 1917-1921--Secret service.
Princeton subject headings:
Donet︠s︡ʹk (Ukraine)--History.
Russian S.F.S.R. Chrezvychaĭnai︠a︡ komissii︠a︡ po borʹbe s kontr-revoli︠u︡t︠s︡ieĭ i sabotazhem
Soviet Union--History--Revolution, 1917-1921--Biography.
Soviet Union--History--Revolution, 1917-1921--Secret service.
Spies--Soviet Union--Biography.