https://www.axios.com/2022/03/10/rise-white-nationalist-hispanics-latinos
https://www.amren.com/news/2022/03/the-rise-of-white-nationalist-hispanics/
https://prismreports.org/2020/12/18/white-mexicans-have-had-a-role-to-play-in-white-supremacy/
https://www.cnn.com/2021/09/04/us/census-browning-of-america-myth-blake/index.html
Hispanic means having Spanish ancestry. The Spanish are Caucasian, the same as Germans, Englishmen, and Italians.
So, if a Hispanic person has only Spanish ancestry, he can be a white supremacist, if that's what he wants to be. :)