During the freedom summer campaign of 1964 in mississippi,
three civil rights workers were kidnapped.
three kkk members were found dead.
three civil rights workers were found dead.
three civil rights workers attacked the kkk.

The answer is three civil rights workers were found dead.

Explanation:

During the Mississippi Summer Project, James Chaney, Andrew Goodman, and Michael Schwerner were three volunteers who were participating in the campaign in the United States which pretended to register many African-American in the state of Mississippi. The three men were in jail until evening but later they were released. Cecil Price, who was a deputy sheriff in  Mississippi, took them on an ambush and later he killed them. The bodies were found on August 4, 1964.

These murders shocked all nation and people who worked in SNCC and COFO asked the FBI to make an investigation. Finally, the newspapers in Mississippi believed that three men's disappearance was "a hoax" concerning publicity's aspects.  

b) that he was not a free man