King's famous "Letter from Birmingham Jail," published in The Atlantic as "The Negro Is Your Brother" and excerpted below, was written in response to a public statement of concern and caution issued by eight white religious leaders of the South. It stands as one of the classic documents of the civil-rights movement.
While confined here in the Birmingham city jail, I came across your recent statement calling our present activities "unwise and untimely." Seldom, if ever, do I pause to answer criticism of my work and ideas. If I sought to answer all of the criticisms that cross my desk, my secretaries would be engaged in little else in the course of the day, and I would have no time for constructive work. But since I feel that you are men of genuine good will and your criticisms are sincerely set forth, I would like to answer your statement in what I hope will be patient and reasonable terms.
I think I should give the reason for my being in Birmingham, since you have been influenced by the argument of "outsiders coming in"