Martin Luther King was raised in a family of ministers. One day, a friend invited him to play at his house, but the boy's mother refused to let Martin in because of the color of his skin. He knew then that something was wrong. He promised himself that when he grew up, he would fight injustice, and that he would do it with the most fearsome weapon of all: words. Today, his name is associated with the birth of the great movement to fight racial segregation in the United States.