They Thought They Were Free by Milton Mayer

An American journalist traveled to Germany in 1935 in an attempt to secure an interview with Hitler. He failed, but what he saw in Berlin chilled him. Nazism, he realized, truly was a mass movement; he needed to talk with the average German. They Thought They Were Free is an indictment of the ordinary citizen on the abdication of moral authority and mass complicity with evil, and a warning to not pretend that our moment, society, or country is fundamentally immune.