“You will not replace us” is a slogan reportedly associated with white nationalist group Identity Evropa, which helped to organize a white nationalist rally in Charlottesville, Virginia, last month.
“You will not replace us” was a chant that was cheered among the white nationalist rally-goers, according to The New York Times.
https://www.washingtonpost.com/news/acts-of-faith/wp/2017/08/14/jews-will-not-replace-us-why-white-supremacists-go-after-jews/
chanted anti-Semitic and Nazi slogans, including "blood and soil" (an English rendering of the Nazi "blut und boden") and "Jews will not replace us"