Fifty years ago, on June 21, 1964, three young men went missing. They were part of Freedom Summer, an effort to register black residents to vote in segregated Mississippi. They were murdered by the local Ku Klux Klan. When their bodies were found a month later, the outrage led to the passage of civil rights protections. On November 24, 2014 President Obama posthumously awarded these three men the highest civilian honor, the Presidential Medal of Freedom, to honor their sacrifice and work towards equality.