On Tuesday, 41 years to the day after a mob of klansmen killed three young civil rights workers in central Mississippi, a jury found an 80-year-old preacher named Edgar Ray Killen guilty of manslaughter in the case. At the time, the killings drew national attention to the racial segregation in Mississippi. American RadioWorks told the story of what came to be known as "Freedom Summer" in their 2001 documentary, "Oh Freedom Over Me."