US treatment of migrant workers under the Bracero program and US usage of Zyklon B on migrant workers as a delousing agent directly inspired Nazis. This came to a head at the so-called bath riots in 1917:

https://en.wikipedia.org/wiki/1917_Bath_riots

This has come up a couple times before on HN:

https://news.ycombinator.com/item?id=38552760

https://news.ycombinator.com/item?id=40381708

https://news.ycombinator.com/item?id=40382627

https://news.ycombinator.com/item?id=40646876