Although American political life has rarely been touched by the most acute varieties of class conflict, it has served again and again as an arena for uncommonly angry minds. Today this fact is most evident on the extreme right wing, which has shown, particularly in the Goldwater movement, how much political leverage can be got out of the animosities and passions of a small minority. Behind such movements there is a style of mind, not always right-wing in its affiliations, that has a long and varied history. I call it the paranoid style simply because no other word adequately evokes the qualities of heated exaggeration, suspiciousness, and conspiratorial fantasy that I have in mind.
Richard Hofstadter, The Paranoid Style In American Politics