The author focuses on the militant organization of the Socialist Revolutionary Party (SR) - one of the most terrible terrorist organizations of the 20th century, as well as Yevno Azef - one of the leaders of Russian terrorists and at the same time a secret employee of the police department. The author explores the phenomenon of Russian terror, the reaction to it of wide sections of society and the government camp. The book describes in detail the confrontation between the government and terrorists, the complex relationship between them. New archival sources are widely used. The book is intended for readers interested in Russian history, politics, social psychology and personality psychology, historians - researchers, teachers, graduate students and students. When designing the book, a photograph was used depicting the Treasury carriage after the famous expropriation committed by the Socialist Revolutionary militants in St. Petersburg on October 14, 1906.