Check out Martin Woosters review of the Cato Encyclopedia.
Incidentally, I cant agree with Woosters claim that the leading thinkers among the Progressives… were generally free of racial prejudice. Perhaps the three names he cites were; I dont know. But racism played a large role in a great deal of Progressive thought (Theodore Roosevelt and Woodrow Wilson are obvious examples). Woosters contrast between racism and eugenics is also puzzling, given how deeply pervaded eugenics was by racist ideas (and vice versa).