Conversation so far:
who was letter from birmingham jail written to
The letter written by Martin Luther King Jr. “Letter from Birmingham Jail” was addressed to his fellow clergymen while he was in jail, Alabama.
How was the letter from birmingham jail delivered
Martin Luther King  smuggled the letter from birmingham jail out with the help of his lawyer, and the nearly 7,000 words were transcribed.
When was the letter from Birmingham Jail written
the letter was written in 1963

Question: What was written
Self-contained rewrite: What was written by Martin Luther King Jr. in the letter from Birmingham Jail