Sergey Mikhailovich Spigelglas or Spiegelglass or Shpigelglas (Russian: Серге́й Миха́йлович Шпи́гельглас) (29 April 1897 – 29 January 1941) was acting head of the Soviet foreign intelligence service, then part of the NKVD,[1] from February to June 1938.
Spigelglas's main task was spying on the White Russian and Trotskyist organizations in Paris, where he controlled the penetration agents Mark Zborowski and Roland Abbiate.
Spigelglas returned to Moscow, where he trained new agents in counterintelligence and acted as deputy director of the Foreign Department reporting to Abram Slutsky.
When Slutsky died in February 1938, poisoned by order of Nikolai Yezhov, Spigelglas became the acting director of foreign intelligence.
Some, following the lead of Alexander Orlov, portray him as a "careerist" ready to liquidate dozens of honest people to advance himself, a man who could disingenuously claim that the deaths of those he murdered were necessary in the Bolshevik's struggle against their enemies.