Slutsky was replaced by Zelman Passov, but soon he was arrested and murdered, his successor Sergey Spigelglas had met with the same fate, and by the end of 1938, he was arrested and murdered.
For most of the history of the Soviet Union there were two intelligence agencies, the First Chief (Foreign Intelligence) Directorate (FCD) of the KGB and Soviet Military Intelligence (GRU).
The term is sometimes extended to several improved algorithms used much later for communication by the First Chief Directorate with its spies.
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