I often ponder why Carl Sagan never added another book to his famous reading list for students, as it makes a fairly reasonable argument that most populist movements are essentially interchangeable =3

"The True Believer: Thoughts on the Nature of Mass Movements" (Eric Hoffer, 1951)

https://www.amazon.com/True-Believer-Thoughts-Nature-Movemen...

I found the following classic an interesting guide:

http://www.amazon.com/True-Believer-Thoughts-Movements-Peren...