Columbia subject headings:
Harvard subject headings:
Informers--Soviet Union--History.
Internal security--Soviet Union--History
Partīi︠a︡ sot︠s︡īalistov-revoli︠u︡t︠s︡īonerov--History.
Revolutionaries--Soviet Union--History.
Russia--Politics and government--1894-1917.
Subversive activities--Soviet Union--History.
Princeton subject headings:
Informers--Russia--History.
Internal security--Russia--History.
Partīi︠a︡ sot︠s︡īalistov-revoli︠u︡t︠s︡īonerov--History.
Revolutionaries--Russia--History.
Russia--Politics and government--1894-1917.
Subversive activities--Russia--History.