Columbia subject headings:
Harvard subject headings:
Censorship--Soviet Union
Russia. Sobstvennai͡a Ego Imperatorskago Velichestva kant͡seli͡arīi͡a. III otdi͡elenīe
Secret service--Soviet Union
Princeton subject headings:
Censorship--Russia.
Secret service--Russia.
Soviet Union. Department polit︠s︡ii.