Second edition of the book. The collection contains 295 documents from the funds of the National Archive of the Republic of Belarus, the State Archive of the Brest Region, the Central Archive of the KGB of the Republic of Belarus, the Archive of the Office of the KGB of the Republic of Belarus in the Brest Region, RGVA, covering the activities of Ukrainian nationalist gangs on the territory of the BSSR in 1939-1953. Most of the documents were previously classified as "secret" and are published for the first time. Included are memos, certificates, information, special communications of various party and state bodies, individual responsible employees in the Central Committee of the Communist Party (b) B, the NKVD of the BSSR and the USSR. In order to comply with the principle of objectivity, materials are given directly to the Ukrainian anti-Soviet underground.