Martin Luther King Jr. is a great example...here's another quote about equal justice in a seriously oppressive atmosphere.

"I have almost reached the regrettable conclusion that the Negro's great stumbling block in his stride toward freedom is not the White Citizen's Counciler or the Ku Klux Klanner, but the white moderate, who is more devoted to 'order' than to justice; who prefers a negative peace which is the absence of tension to a positive peace which is the presence of justice; who constantly says: 'I agree with you in the goal you seek, but I cannot agree with your methods of direct action'"
~ Dr. Martin Luther King, Jr.
"Letter from a Birmingham Jail"
April 16, 1963