Domestic TerrorismZyklon B January 2008, Cervera de los Montes Ø 9.5 x cm Adhesive label on plastic bottle i Zyklon B was the brand of a cyanide-based insecticide notorious for its use by Nazi Germany to kill over one million people in the gas chambers of Auschwitz. The bottle is a 1.5 liter milk container of Hacendado, Spanish supermarket chain Mercadona's private brand. 10 / 12