Zyklon B
The corporation Tesch &amp; Stabenow (in short Testa) was a market leader in pest control chemicals between 1924 and 1945 in Germany east of the Elbe. Testa distributed Zyklon B, a pesticide consisting of inert adsorbents saturated with hydrogen cyanide, a volatile liquid extremely toxic to animals and humans. For legitimate use as a pesticide, Zyklon B included a warning odorant as not everyone can smell cyanide or recognize its faint almond-like odor. The company sold Zyklon B to the Wehrmacht and the SS in Auschwitz-Birkenau without the odorant, clearly showing that it was intended for use on humans. Two directors of Testa were convicted and executed after being accused of assisting the mass murder of Jews during the Second World War.