Dick Gregory has been an unsparing and incisive cultural force for more than fifty years: a friend of such luminaries as Dr. Martin Luther King Jr. and Medgar Evers, Gregory is an unrelenting, lifelong activist against social injustice, whether he was marching in Selma during the Civil Rights movement or organizing student demonstrations to protest the Vietnam War, participating in rallies for Native American and feminist rights or fighting apartheid in South Africa.