Communism was one of the most powerful political and intellectual movements the world has ever seen. At the height of their influence, Communists controlled more than a third of the earth’s surface. But perhaps more astonishing than its rapid rise and extraordinary reach was Communism’s sudden, devastating collapse in November of 1989. In The Red Flag, Oxford professor David Priestland tells the epic story of a movement that has taken root in dozens of countries across two hundred years, from its birth after the French Revolution to its ideological maturity in nineteenth-century Germany to its rise to dominance (and subsequent fall) in the twentieth century.