" Who, then, is responsible for these horrific crimes, the crimes that opened the door to the even greater horrors of the Holocaust? The Nazis are, of course. But where did they get the idea to do this? The answer is that they got it from American progressives. Not “Democrats” this time, but specifically “progressives.” By progressivism, I refer to the early twentieth-century, left-wing movement that sought to reform labor laws and working conditions but was also obsessively concerned with social improvement through race-based immigration restriction and the elimination of so-called inferior, unfit, and disposable people. "

― Dinesh D'Souza , The Big Lie: Exposing the Nazi Roots of the American Left