The Slovak Nation’s Memory Institute was founded in 2003. Its statutory tasks comprise of: evidencing, collecting, administrating and making available documents of the repression apparatus of the Third Reich, the USSR and state security authorities, which were produced and collected from 18th April 1939 until 31st December 1989, and referred to crimes committed on Slovak nationals or Slovak citizens of other nationalities. The Institute collects, inter alia, audio-visual material produced by the Security Service of the Communist regime. It was taken over from various institutions, inter alia, the Slovak Information Service, the Police Academy, state archives, and individuals. Above all, the film collections comprise of operational material (different types of evidence, recorded interviews, or monitoring), instructional and educational films for agents and officers, propaganda material, as well as many films confiscated by the Security Service from individuals. The article defines the most interesting examples of such material, currently stored in the collection of the Slovak Nation’s Memory Institute.