During the Civil War, the fight against the ideological enemy was carried out not only at the front, but also in the rear. This book will tell about the organization, structure and activities of Kolchak’s counterintelligence and state security of the Police Department of the Ministry of Internal Affairs. The authors paid great attention to the personnel potential of these structures; biographical information about many heads of provincial state security departments is provided for the first time. The structures headed by former gendarmerie officers were a reliable support for the Kolchak regime. From the moment of its creation until the defeat of the White armies in Siberia, they effectively fought the Bolshevik underground and Socialist Revolutionary organizations, expertly studied the mood of the broad masses, and informed the leadership about the reasons for dissatisfaction with the policies of the authorities of various segments of the population. The work is intended for readers interested in the history of the Civil War and the White Movement and domestic intelligence services.