The Question and Answer section for Letter From Birmingham Jail is a great resource to ask questions, find answers, and discuss the novel.
For the most part, church leaders responded positively to King's letter. They began to organize groups of black and white people to take "direct action" in the form of protests and sit-ins.
I'm not sure what your question is here?
Martin Luther King said that people must resort to passive resistance and at as a very last resort, violence for self-defense.