In the West, it is almost universally believed that the pesticide was used by Nazi Germany in the Holocaust gas chambers of the Auschwitz Birkenau and Majdanek extermination camps. There are some people who dispute this (see holocaust denial).
Zyklon B was used in the concentration camps initially for delousing to control typhus. In September 1941, the first experiments were performed in Auschwitz I to test the killing of humans with the poison. Zyklon B was provided by the German companies 'Degesch (Deutsche Gesellschaft für Schädlingsbekämpfung GmbH) and Tesch und Stabenow, under license from I.G. Farben, which held the patent. The Nazis ordered Degesch to produce Zyklon B without the warning chemical, a breach of German law. After the war, two directors of Tesch were tried by a British military court and were executed for their part in supplying the chemical.
Zyklon B was originally developed in the 1920s by Fritz Haber, a German Jew who was forced to emigrate in 1934.
The use of the word zyklon (German for cyclone) continues to prompt angry reactions from Jewish groups. In 2002 both Bosch Siemens Hausgeraete and Umbro were forced to withdraw from attempts to use or trademark the term for their products.
Zyklon A was also a pesticide, using methyl cyanoformate as the active agent. Its manufacture was banned under the Treaty of Versailles as it could be an intermediate in poison gas production.
Use on humans
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