In the long history of American demagogues, from Huey Long to Donald Trump, never has one man caused so much damage in such a short time as Senator Joseph McCarthy. We still use "McCarthyism" to stand for outrageous charges of guilt by association, a weapon of polarizing slander. From 1950 to 1954, McCarthy destroyed many careers and even entire lives, whipping the nation into a frenzy of paranoia, accusation, loyalty oaths, and terror. His chaotic, meteoric rise is a gripping and terrifying object lesson for us all. Yet his equally sudden fall from fame offers hope that, given the rope, most American demagogues eventually hang themselves. Only now, through best-selling author Larry Tye's look at the senator's records, can the full story be told.