". . . I knew that I could never again raise my voice agains the violence of the oppressed in the ghettos without having first spoken clearly to the greatest purveyor of violence in the world today: my own government. . . . for the sake of those boys, for the sake of this government, for the sake of the hundreds of thousands trembling under our violence, I cannot be silent."-Martin Luther King, Jr., April, 1967, Riverside Church, New York