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 Security Troops which monitored/managed national, foreign, and overseas communications, cryptologic equipment, and research and development, and possibly the Sixteenth Directorate (SIGINT and communications interception) which operated the national and government telephone and telegraph systems. Such troops were reportedly employed, along with the MVD's Internal Troops, to suppress public protests and disperse demonstrations, such as that of the Crimean Tatars in July 1987 and those in the republics of Armenia and Azerbaijan in March 1988. Special KGB troops also were trained for sabotage and diversionary missions abroad. Other special KGB troops were intended for counterterrorist and counterinsurgency operations. The uniforms and insignia of