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 as Western tourists. They were to gain the trust of and spy upon the most outspoken proponents of Alexander Dubček's new government. They were to plant subversive evidence, justifying the USSR's invasion, that right-wing groups—aided by Western intelligence agencies—were going to depose the Communist government of Czechoslovakia. Finally, the KGB prepared hardline, pro-USSR members of the Communist Party of Czechoslovakia (CPC), such as Alois Indra and Vasiľ Škultéty, to assume power after the Red Army's invasion. The KGB's Czech success in the 1960s was matched with the failed suppression of the Solidarity labour movement in 1980s Poland. The KGB had