About the book: 2016 / The publication includes memoirs of the heads of security departments in Moscow and St. Petersburg (A. V. Gerasimova, P. P. Zavarzina, A. . T. Vasilyeva), telling about the working days of political detectives in the late 19th – early 20th centuries. The memoirs tell about high-profile political cases associated with the names of famous provocateurs - Sergei Degaev, Yevno Azef, Georgy Gapon, etc. The memoirs give characteristics of the largest figures of political investigation (S.V. Zubatov, S.P. Beletsky, etc.). The authors introduce readers to the investigative techniques used in operational work to combat terrorism in Russia.