On tactical errors, and the need of a protest movement to have a goal:

The mistake I made there was to protest against segregation generally rather than against a single and distinct facet of it. Our protest was so vague that we got nothing, and the people were left very depressed and in despair. It would have been much better to have concentrated upon integrating the buses or the lunch counters. One victory of this kind would have been symbolic, would have galvanized support and boosted morale. But I don’t mean that our work in Albany ended in failure. The Negro people there straightened up their bent backs; you can’t ride a man’s back unless it’s bent. Also, thousands of Negroes registered to vote who never had voted before, and because of the expanded Negro vote in the next election for governor of Georgia—which pitted a moderate candidate against a rabid segregationist—Georgia elected its first governor who had pledged to respect and enforce the law impartially. And what we learned from our mistakes in Albany helped our later campaigns in other cities to be more effective. We have never since scattered our efforts in a general attack on segregation, but have focused upon specific, symbolic objectives.

via "Militant as Well as Moderate": Martin Luther King's Longest Interview