The book traces the development of the thieves' language, which is commonly called “thieves' music”; a voluminous dictionary of slang interpretation of words and expressions of normative vocabulary is provided. You will also be able to learn about the peculiarities of transmitting information in prisons and camps, about the language of gestures, facial expressions, shadows and other methods of communication between criminals. Personal letters and notes from godmen, informers, prostitutes, drug addicts, etc. are presented. The material is illustrated with photographs, most of which were taken in special regime zones where repeat offenders are kept, and are published for the first time. For a wide range of readers.