Columbia subject headings:
Russian S.F.S.R. Chrezvychaĭnai︠a︡ komissii︠a︡ po borʹbe s kontr-revoli︠u︡t︠s︡ieĭ i sabotazhem.
Secret service--Soviet Union--History.
Soviet Union--History--Revolution, 1917-1921--Secret service.
Harvard subject headings:
Counterrevolutions--Soviet Union--History--20th century--Sources.
Russian S.F.S.R. Chrezvychaĭnai︠a︡ komissii︠a︡ po borʹbe s kontr-revoli︠u︡t︠s︡ieĭ i sabotazhem--History--Sources.
Soviet Union--History--Revolution, 1917-1921--Protest movements--Sources.
Princeton subject headings:
Russian S.F.S.R. Chrezvychaĭnai︠a︡ komissii︠a︡ po borʹbe s kontr-revoli︠u︡t︠s︡ieĭ i sabotazhem
Secret service--Soviet Union--History.
Soviet Union--History--Revolution, 1917-1921--Secret service.