Richard B. Spencer is a leading figure in the American Alt-Right (he even created the name). Here's a section from the beginning of his Wikipedia article:

Richard Bertrand Spencer (born May 11, 1978) is a noted American white supremacist. He is president of the National Policy Institute, a white nationalist think tank, and Washington Summit Publishers, an independent publishing firm. Spencer has stated that he rejects the description of white supremacist, and describes himself as an identitarian. He advocates for a white homeland for a "dispossessed white race" and calls for "peaceful ethnic cleansing" to halt the "deconstruction" of European culture.

I'm not sure what a "peaceful ethnic cleansing" would look like, and I don't think I want to find out.