Martin Luther King, Jr. is a radical hero that should be remembered for his ethical challenge to the American government/people:
In this excerpt from Shambhala magazine Charles Johnson reveals The King We Need.
Earl Ofari Hutchison at AlterNet examines how many local government agenices still ignore this national Holiday for a Hero.
Martin Luther King was a pacifist in that he preached change through non-violent protest, but he was not "passive" when confronted with the need to address injustice and oppression. His words were an active rallying cry for a re-vision of the United States of America... now that he has a holiday, streets, and schools named for him it is easy to forget how he, and other strong souls, fearlessly spoke truth to power:
Film: Honor the Legacy
One of the better articles attempting to realize Martin Luther King's "truth force":
Dr. King: The Remix
And from Cornel West (thanks to Ray Garraud for pointing this essay out):
Prisoners of Hope