workingclasshistory:

On this day, 28 January 1917, Carmelita Torres, a 17-year-old Mexican maid who worked in the United States, refused to take the mandatory gasoline bath given to day labourers at the border, and convinced 30 other trolley passengers to join her. Her protest spread in what became known as the bath riots.
Torres was one of many workers who crossed the border between Juarez and El Paso each day. In the name of public health, Mexican workers were frequently subjected to degrading and humiliating treatment. They had to strip naked, bathe, undergo a toxic gasoline bath, and have their clothes steamed. The stated aim of the programme was to kill lice, which can spread typhus. However, it was not applied to everyone crossing the border: just working class Mexicans. In addition to gasoline being poisonous, it was also a deadly fire risk. A group of prisoners in El Paso being treated with gasoline were burned to death in an accidental fire. Furthermore, US health workers were secretly photographing naked Mexican women.
On January 28, anger at the practice finally exploded, and within a few hours Torres had amassed a crowd of several thousand mostly women protesters. They blocked all traffic and trolleys into El Paso. They pelted immigration officers with rocks and bottles when they try to disperse them, and when US and then Mexican troops arrived they received the same treatment. The riots were eventually suppressed by the soldiers, and Torres herself was arrested. This appeared to have the effect of discouraging future protests.
The enforced bathing and fumigation of Mexican workers with toxic chemicals like gasoline, and later DDT and Zyklon B, continued until the 1950s. The use of Zyklon B at the border appealed to scientists in Nazi Germany, who in the late 1930s began using the agent at borders and in concentration camps for delousing. Although notoriously they later used it to exterminate millions of people in the Holocaust. https://www.facebook.com/workingclasshistory/photos/a.1819457841572691/2196701533848318/?type=3