Bruno Tesch

Bruno Emil Tesch was a German chemist and entrepreneur. Together with Gerhard Peters and Walter Heerdt, he invented the insecticide Zyklon B, infamous for having been used by Nazi Germany to exterminate approximately a million of the victims of the Holocaust. He was the owner of Tesch amp Stabenow , a pest control company he cofounded in 1924 with Paul Stabenow in Hamburg, Germany, which was a major supplier of Zyklon B to the Nazi concentration camps.

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Source: Wikipedia