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 Archiver algorithm for making its KGB files. It has ten levels of compression, from very weak to maximum. However, at higher compression levels, the time required to compress a file increases significantly. The official website is now offline. The minimum requirements for running KGB Archiver are: KGB Archiver KGB Archiver is a file archiver and data compression utility based on the PAQ6 compression algorithm. Written in Microsoft Visual C++ by Tomasz Pawlak, KGB Archiver is designed to achieve a very high compression ratio. As a consequence, the program is relatively memory- and CPU-intensive. KGB Archiver is free and open-source software released