https://en.wikipedia.org/wiki/They_Thought_They_Were_Free
They Thought They Were Free: The Germans 1933-45 is a 1955 nonfiction book written by Milton Mayer, published by the University of Chicago Press. It describes the thought process of ordinary citizens during Nazi Germany.
August Heckscher, the chief writer of editorials of the New York Herald Tribune, wrote that the book "suggests how easy it is for human beings in any society to fall prey to a dynamic political movement, provided their lives are sufficiently insecure, frustrated or empty."[1] He stated that the book is simultaneously a discussion on ethics, on "how political tyranny is established", and on issues in Germany and the "German mentality".[1]