While jailed for violating an injunction against protesting, in April, 1963, Dr. King wrote a letter in response to white local clergy who criticized his work and in support of the importance of civil rights protesting. This important document is known as the "Letter from a Birmingham Jail." For more information and historical context:
In 1967, Dr. King spoke at Stanford University about racism and civil rights in American society, focusing on racism, poverty and economic justice.