Zyklon B arrived in El Paso in the 1920s courtesy of the US government. In 1929, for example, a Public Health Service officer, J.R. Hurley, ordered $25 worth of the material--hydrocyanic acid in pellet form--as a fumigating agent for use at the El Paso delousing station, where Mexicans crossed the border from Juárez. Zyklon, developed by Degesch (short for the German vermin-combating corporation), was made in varying strengths, with Zyklon C, D and E representing gradations in potency and price. As Raul Hilberg describes it in The Destruction of the European Jews, "strength E was required for the eradication of specially resistant vermin, such as cockroaches, or for gassings in wooden barracks. The 'normal' preparation, D, was used to exterminate lice, mice, or rats in large, well-built structures containing furniture. Human organisms in gas chambers were killed with Zyklon B." In 1929 Degesch divided the Zyklon market with an American corporation, Cyanamid, so Hurley likely got his shipment from the latter.

As David Dorado Romo describes it in his marvelous Ringside Seat to a Revolution: An Underground History of El Paso and Juárez: 1893-1923 (Cinco Puntos Press, El Paso), Zyklon B became available in the United States when, in the early 1920s, fears of alien infection were being inflamed by the alarums of the eugenicists, most of them political "progressives." In 1917 Congress passed, and President Wilson--an ardent eugenicist and pro-sterilizer--signed, the Immigration Act. The Public Health Service simultaneously published its Manual for the Physical Inspection of Aliens.

The manual had its list of excludables from the US of A, a ripe representation of the obsessions of the eugenicists: "imbeciles, idiots, feeble-minded persons, persons of constitutional psychopathic inferiority [homosexuals], vagrants, physical defectives...anarchists, persons afflicted with loathsome or dangerous contagious diseases...all aliens over 16 who cannot read." In that same year Public Health Service agents "bathed and deloused" 127,123 Mexicans at the bridge between Juárez and El Paso.

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