I am unalterably opposed to any species of vigilantes or to any other extra-legal means of a majority exercising its will over a minority … I believe that if majorities are entitled to have their civil rights protected they should be willing to fight for the same rights to minorities no matter how violently they disagree with their views. Further, I am convinced that this is the only way they can be preserved.
I believe that the American concept of civil rights should include not only an observance of our Constitutional Bill of Rights, but also absence of arbitrary action by government in every field.

Views on civil rights declared in the summer of 1938, quoted in Justice for All : Earl Warren and the Nation He Made (2006) by Jim Newton, p. 95