Mourners attend the funeral of one of four young girls killed in a September 15, 1963, bombing of the Sixteenth Street Baptist Church in Birmingham, Alabama. “We thought it would have been a safe place, but the racists didn’t think so,” said Wyatt Tee Walker, Martin Luther King’s chief of staff. In 1963, thousands of children came to the church for protest marches. Some were jailed; others were dispersed by police dogs and high-powered hoses. Photographs of such mistreatment brought the civil rights movement new worldwide support. (© AP Images)