In the years from 1944 to 1956 Faustyn Grzybowski, Tadeusz Piątkowski, Józef Pluta, Władyslaw Szysz, Teodor Mikuś, Daniel Kubajewski, Stanisław Mrożek and Bolesław Krzywiński were respectively in charge of the Voivodeship Office of Public Security in Białystok. Their personal files include the information from private and professional life of the officers and they also reflect mentality of people holding the highest positions in the state. The essence of their ‘mission’ was to persuade about the validity of the communist idea and the leading role of the Soviet Union in building the communism all over the world. The emerging picture of ‘security services’ presents impunity of their employees, a low ethical level and lack of professionalism. Against the new reality some of them took an attitude full of cynicism and the post-war conditions opened the way for professional career for them. The work of the officers of the public security consisted in surveillance and persecution of the society whereas the preserved documentation left no doubt as to their real role and place in the current social and political system.