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Okhrana - Wikipedia
Okhranka | Tsarist Era, Secret Police, Surveillance | Britannica
Enforcing Russian autocracy - Alpha History
Double Exposure: Russia's Secret Police under the Last Tsars
Third Department | Tsarist, Intelligence, Surveillance | Britannica
The Tsarist Secret Police and Russian Society, 1880-1917
Terror and Policing in Revolutionary Russia - Boston University
The Russian Secret Police - Google Books