Sergey Spigelglas
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Sergey Mikhailovich Spigelglas Сергей Михайлович Шпигельглас (29 April 1897, Grodno region - 29 January 1941) was acting head of the Soviet foreign intelligence service, then part of the NKVD, from February to June 1938, but was arrested that year as an "enemy of the people". He was executed two and a half years later.
Spigelglas had joined the Foreign Department of the Cheka in 1922.