In article on materials of archives of the Astrakhan region activity of quick and KGB office of camp for prisoners of war No. 204 on formation of a secret-service network for identification of the war criminals making crimes in the territory of the USSR, and also those who tried to destabilize a situation in camps is recreated. According to the leading documents of People's Commissariat for Internal Affairs-Ministry of Internal Affairs nazi criminals shared on two categories: main war criminals and criminals. The Vnutrilagerny agency played a significant role in disclosure of war criminals among prisoners.