On June 29, 1964, the FBI began distributing these pictures of civil rights workers, from left, Michael Schwerner, 24, of New York, James Chaney, 21, from Mississippi, and Andrew Goodman, 20, of New York, who disappeared near Philadelphia, Miss., June 21, 1964. The three civil rights workers, part of the “Freedom Summer” program, were abducted, killed and buried in an earthen dam in rural Neshoba County. (AP Photo/FBI)