TY
I read more about Red Caesarism, which led me to "The Three Faces of Fascism" by Ernst Nolte. I borrowed it from the Internet Archive for an hour. It's a good read so far. The author looks at fascism as an era, leading up from WWI through WWII.
It was a mood, attitude or malaise as much as it was a political movement. Citizens longed for order, control and a return to the way things once were.
For Trump's base, the current era is not much different.