“Extremism, he says, is the universal tuberculosis of modern society: a world infection of resentment and hatred generated by rapid change and the breakdown of old values. In the stabler nations the tubercles are sealed off in scar tissue, and these are the harmless lunatic movements. In times of social disorder, depression, war, or revolution, the germs can break forth and infect the nation. This has happened in Germany. It could happen anywhere, even in the United States.”