Active reserve (KGB) officers with a military rank who worked undercover in the Soviet Union. "Trusted contacts" were high placed civilians who collaborated with the KGB without signing any official working agreements, such as directors of personnel departments at various institutions, academics, deans, or writers and actors. Informers were citizens secretly recruited by the KGB, sometimes using forceful recruitment methods, such as blackmail. The precise number of people from various categories remains unknown, but one of the estimates was 11 million "informers" in the Soviet Union, or one out of every eighteen adult citizens The active reserve was established by Yuri Andropov in
KGB prison cells KGB prison cells The former KGB prison cells at Pagari 1, Tallinn were opened for visitors in 2017 July. The cells are administrated by the Vabamu Museum of Occupations and Freedom. Pagari 1 is a house with a colourful past. In March 1918, during a time when the newly declared independence was still incredibly fragile, the residential building housed the Provisional Government of the Republic of Estonia. The Estonian War of Independence (1918–1920) was also coordinated from within these walls, and until 1940, it was the location of the Ministry of War of the Republic of Estonia. In March 1991,