Martin Luther King gave this speech on 3 April 1968 at the Church of God in Christ, in Memphis, Tennessee. The last part of this speech in particular seems eerily prophetic.
He was assassinated the next day on 4 April 1968.
“All governments suffer a recurring problem: power attracts pathological personalities. It is not that power corrupts but that it is magnetic to the corruptible. Such people have a tendency to become drunk on violence, a condition to which they are quickly addicted."
Frank Herbert, Chapterhouse Dune, March 1985