Donald Trump’s success in the primaries and his rhetoric have sparked troubled meditations about an awakening of fascist impulses among his supporters. Bret Stephens has drawn an analogy with the Thirties, “the last dark age of Western politics,” and compared Trump to Benito Mussolini. On the left, Dana Milbank, in a column titled “Trump Flirts with Fascism,” wrote about a campaign rally at which Trump was “leading supporters in what looked very much like a fascist salute,” a scene New York Times house-conservative David Brooks linked to the Nuremberg party rallies.