What was King's purpose for writing "letter from Birmingham Jail"

Altogether, King's letter was a powerful defense of the motivations, tactics, and goals of the Birmingham campaign and the Civil Rights Movement more generally. King began the letter by responding to the criticism that he and his fellow activists were "outsiders" causing trouble in the streets of Birmingham.

Explanation:

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The "Letter from Birmingham Jail", also known as the "Letter from Birmingham City Jail" and "The Negro Is Your Brother", is an open letter written on April 16, 1963, by Martin Luther King Jr. It says that people have a moral responsibility to break unjust laws and to take direct action rather than waiting potentially forever for justice to come through the courts. Responding to being referred to as an "outsider", King writes: "Injustice anywhere is a threat to justice everywhere."

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