A Short History of Zyklon B on the US-Mexican Border (Please Don't Share With Donald Trump) - CounterPunch.org
Inspection of Mexican immigrants by the US Public Health Service. Zyklon B came to El Paso in the 1920s. In 1929, for example, a U.S. Public Health Service officer, J.R. Hurley, ordered $25 worth of the material–hydrocyanic acid in pellet form–as a...