For some reason I was drawn to re-read The Ox-bow Incident, recently, after many, many years. In the afterword, I was struck with what the author, Walter Van Tilburg Clark, had to say and how applicable it is to our times (emphasis is mine):

"The book was written in 1937 and '38, when the whole world was getting increasingly worried about Hitler and the Nazis, and emotionally it stemmed from my part of this worrying. A number of the reviewers commented on the parallel when the book came out in 1940, saw it as something approaching an allegory of the unscrupulous and brutal Nazi methods, and as a warning against the dangers of temporizing and of hoping to oppose such a force with reason, argument, and the democratic approach. They did not see, however, or at least I don't remember that any of them mentioned it (and that did scare me), although it was certainly obvious, the whole substance and surface of the story, that it was a kind of American Naziism that I was talking about. I had the parallel in mind, all right, but what I was most afraid of was not the German Nazis, or even the Bund, but that ever-present element in any society which can always be led to act the same way, to use authoritarian methods to oppose authoritarian methods.

"What I wanted to say was It can happen here. It has happened here, in minor but sufficiently indicative ways, a great many times.