If you thought the New Left was dead in America, think again. Walk through just about any of the nation’s inner cities, and you’re likely to find an office of ACORN, bustling with young people working 12-hour days to “organize the poor” and bring about “social change.” The largest radical group in the country, ACORN has 120,000 dues-paying members, chapters in 700 poor neighborhoods in 50 cities, and 30 years’ experience. It boasts two radio stations, a housing corporation, a law office, and affiliate relationships with a host of trade-union locals. Not only big, it is effective, with some remarkable...