This is one of the most fascinating books I have ever read, even though it was written in 1951.
Longshoreman-turned-philosopher Eric Hoffer scrutinized and analyzed mass movements and their various members, ranging from ideologues to greedheads, dissecting them in detail, separating out the wheat of activity and behavior from the chaff of rhetoric and ideology, to see how they and their members work, and their impact.
At the time, Nazism was freshly buried, Stalinist Communism was powerful, and many of the ideologies of the 1960s did not exist. However, Mr. Hoffer's analysis of the movements of the time easily apply to other movements, going on into the present day.
The book is short, written in a crisp style, and is easily accessible to many education levels. President Dwight D. Eisenhower highly recommended it to everyone he worked with, and cited it in an early press conference.
Once you read this, you can take with a bit more perspective (and a lot more salt) the angry denunciations of today's conspiracy theorists and other blowhards, and figure out why they keep on going.