Sidney Poitier attends a promoting the film ‘Les aventuriers’ during the 59th International Cannes Film Festival May 19, 2006 in Cannes, France. (Shutterstock) By Aram Goudsouzian, The Conversation In the summer of 1967, Martin Luther King Jr. introduced the keynote speaker for the 10th-anniversary convention banquet of the Southern Christian Leadership Conference. Their guest, he […]