Columbia subject headings:
Police--Soviet Union--History.
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡--History.
Russia. Okhrannyi︠a︡ otdi︠e︡lenīi︠a︡--History.
Secret service--Soviet Union--History.
Harvard subject headings:
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡.
Russia--History--Nicholas I, 1825-1855.
Russia. Okhrannyi︠a︡ otdi︠e︡lenīi︠a︡
Princeton subject headings:
Police--Soviet Union--History.
Rossiĭskai︠a︡ sot︠s︡ial-demokraticheskai︠a︡ rabochai︠a︡ partii︠a︡--History.
Russia. Okrannyi︠a︡ otdi︠e︡lenīi︠a︡--History.
Secret service--Soviet Union--History.