"I am in Birmingham because injustice is here," declared Martin Luther King, Jr. He had come to that city of racist terror convinced that massive protest could topple Jim Crow. But the insurgency faltered. To revive it, King made a sacrificial act on Good Friday, April 12, 1963: He was arrested. Alone in his cell, reading a newspaper, he found a statement from eight "moderate" clergymen who branded the protests extremist and "untimely".