Google: “Zyklon B” and “Mexican farm workers” and you will see that the United States Department of Immigration was using Zyklon B to fumigate and delouse immigrant farm laborers back in the 1920’s and 1930’s.
Produced by theGerman companypest controlDEGESCH, the infamous“Zyklon” (hydrocyanic acid)wassold infour versionswith different power. Zyklon Ewasrecommendedto clearenvironmentsweedsdie hard,like cockroaches.ZyklonD waspreparedmost widely usedfreeenvironments (the holdsof ships,concrete buildingswith furniturein the rooms)with lice,mice and rats. Apparently,it was enoughfor humanstheless powerful version, the ZyklonB. Buton humanswas not used forthe first timein Germany. Zyklon B was usedsince 1929in the United Statesby the health(U.S. Public HealtService)on the border withMexico, tocomb and trimMexican migrantstransitingfromJuarez toElPaso.
Before Zyklon B was even introduced the US government was stripping Mexicans alongside the border and drenching them in various insecticides such as DDT but also “bathed” them in sulfuric acid, kerosene and gasoline. All for a supposed typhus epidemic that never existed/was exaggerated.