On June 20, 1964, just as civil rights activists were beginning to arrive in Mississippi, a Neshoba County sheriff's deputy pulled over a car for a traffic violation and then arrested and took into custody the three young civil rights activists in the car, James Chaney, Andrew Goodman, and Michael Schwerner. After being arrested, all three were then released and apparently began heading back to nearby Meridian, only to be pulled over by two carloads of KKK (Ku Klux Klan) members. None of the three was heard from again until their bodies were found in an earthen dam two months later. They had been murdered and the only black among the three, James Chaney, had been mutilated. Zinn and other representatives of SNCC attended a later memorial service for the three murdered civil rights workers. The service was held at the ruins of the Mount Zion Baptist Church, the burning of which Chaney, Goodman, and Schwerner had gone to investigate before they were pulled over and arrested in Neshoba County.