On May 13, 1965, local investigators and the FBI formally named Blanton, Cash, Chambliss, and Cherry as the perpetrators of the bombing, with Robert Chambliss the likely ringleader of the four. This information was relayed to the Director of the FBI, J. Edgar Hoover; however, no prosecutions of the four suspects ensued. There had been a history of mistrust between local and federal investigators. Later the same year, J. Edgar Hoover formally blocked any impending federal prosecutions against the suspects, and refused to disclose any evidence his agents had obtained with state or federal prosecutors.