My friends, the time for action is upon us. The enemies of justice wants you to think of Dr. King as only a civil rights leader, but he had a much broader agenda. He was a tireless crusader for the rights of the poor, for an end to the war in Vietnam long before it was popular to take that stand, and for the rights of workers everywhere.
Many people find it convenient to forget that Martin was murdered while supporting a desperate strike on that tragic day in Memphis, Tennessee. He died while fighting for the rights of sanitation workers.
Dr. King's dedication to the rights of the workers who are so often exploited by the forces of greed has profoundly touched my life and guided my struggle.

Lessons of Dr. Martin Luther King, Jr. (1990)