The monograph, which is based on documents introduced into scientific circulation for the first time, is devoted to the activities of the Cheka - OGPU bodies to ensure the security of the armed forces. In the book, the reader will find unconventional assessments of the activities of both security officers (including Dzerzhinsky) and military workers, and will more fully see the relationship between the work of state security agencies in the Red Army with the general foreign policy situation and within the country, with specific decisions of the highest party and state leadership of the RSFSR - USSR. In the monograph The absurdity of statements often found in historical literature about the period of the 1920s - early 1930s about the negative role of security officers in strengthening the defense capability of the country and the Red Army in particular is explained. Employees of the Cheka - OGPU, on the contrary, did everything in their power to strengthen the armed forces, to eliminate or minimize the harmful consequences of real-life threats to the army and navy of our country.