Abram Slutsky
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Abram Aronovich Slutsky Абрам Аронович Слуцкий (July 1898, Parafievka, Chernigov region - 17 February 1938, Moscow) headed the Soviet foreign intelligence service (GUGB), then part of the NKVD, from May 1935 to February 1938.
Slutsky was poisoned on the orders of Nikolai Yezhov in the office of the head of the GUGB, Mikhail Frinovsky. Two months after his death he was posthumously expelled from the CPSU.