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 victim memorials visitors. Part of the cells, lock-ups and the corridor in the basement have been restored. The Museum of Genocide Victims was set up in Vilnius on 14 October 1992 in the former KGB headquarters (which had been used by the Gestapo during the Nazi occupation). The building also houses the Lithuanian Special Archive, where documents of the former KGB archive are kept. "The Black Door", a memorial at the former KGB building on Stabu Street in Rīga, was unveiled in 2003. The memorial, designed by artist Glebs Pantelejevs, is a half-open steel door and a commemorative plaque. A memorial and