November marks the 20th anniversary of the start of the Tawana Brawley affair--an incident that inflamed racial relations in New York and across the country after a teenage girl alleged that she had been sexually assaulted and abused by police. The ensuing media circus thrust Rev. Al Sharpton into the limelight and established his bona fides as a community spokesman. It also tarnished the reputations of the people she accused of raping her and, later......