On Jan. 3, 1964, Time magazine named the Rev. Martin Luther King Jr. Man of the Year for 1963. It is difficult to overstate how important he was to the struggle for civil rights in America. His words and deeds inspired millions to join the civil rights movement, and spread the idea of nonviolent resistance as a means of fighting injustice. His tragic assassination in 1968 halted his work, but not his dream. In honor of MLK and his enduring legacy, we look back at some of the people who worked alongside him. After King was killed, these crusaders picked up the mantle and kept marching forward to the promised land.