Secret history of domestic counterintelligence

On May 6, 1922, it was decided to create an independent counterintelligence unit in the structure of the bodies of the United State Political Administration (OGPU) - the counterintelligence department (Cro), the direct successor of which is the modern counterintelligence service of the FSB of Russia.
Over the past 100 years, many secrets have accumulated. Some of them in their articles were revealed by the authors of the collection. The struggle of the NKVD employees with German intelligence officers and saboteurs during the Great Patriotic War. Unknown details of countering the Chekists operations of Western intelligence "Jungle", "Icon", "Cartel" and others. Active measures of Soviet counterintelligence in the Baltic states in the first decade of the Cold War. The history of the second main management (counterintelligence) of the KGB from creation to disbandment