This document is a formal complaint filed by Ladislav Hejdánek to the Prague City Prosecutor's Office on February 28, 1977. Hejdánek details a series of violations of "socialist legality" committed by officers of the State Security (StB) during his interrogations and house searches in January 1977. The petitioner highlights illegal procedures such as being detained without a warrant, conducting house searches without a valid prosecutor's signature, and the manipulation of official protocols. He further criticizes the mistreatment of his family and a neighbor, as well as the arbitrary seizure of private cassette tapes. Hejdánek requests a formal investigation into the conduct of the SNB officers and calls for systemic measures to prevent further illegal harassment of citizens. The complaint also notes formal deficiencies in a summons received from the prosecutor's office. This text provides valuable insight into the repressive tactics of the communist regime during the "Normalization" era in Czechoslovakia.