Historically, revolutions are bloody. Oh, yes, they are. They haven't never had a bloodless revolution, or a nonviolent revolution. That don't happen even in Hollywood. You don't have a revolution in which you love your enemy, and you don't have a revolution in which you are begging the system of exploitation to integrate you into it. Revolutions overturn systems. Revolutions destroy systems.

The Ballot or the Bullet (1964) - Speech in Detroit, Michigan (12 April 1964)