Two, four, six, eight, we don't want to integrate rose in a descant above the cacophony of insults and obscenities shrieked by a crowd of angry white women in pincurlers and toreador pants lining the sidewalks leading to the William Frantz Elementary School in a blue-collar section of New Orleans. Their chanting set the pace for a six-year-old black girl, who thought it sounded like a nursery rhyme, to march toward the redbrick building on the sultry,...