Dr. Martin Luther King, Jr. delivered his I Have Been To The Mountaintop speech on April 3, 1968.
He was assassinated the following day.
All we say to America is, “Be true to what you said on paper.” If I lived in China or even Russia, or any totalitarian country, maybe I could understand some of these illegal injunctions. Maybe I could understand the denial of certain basic First Amendment privileges, because they hadn’t committed themselves to that over there. But somewhere I read of the freedom of assembly. Somewhere I read of the freedom of speech. Somewhere I read of the freedom of the press. Somewhere I read that the greatness of America is the right to protest for right. And so just as I say, we aren’t going to let any injunction turn us around. We are going on.
Martin Luther King, Jr.
References: Full text of speech