From New America Media:
“Before President Kennedy’s assassination, the Secret Service had credible evidence that a gunman would attempt to kill the President either in Chicago or Miami, Bolden said.
“The Chicago office of the Secret Service never acted on the threats, Bolden said.
“After President Kennedy’s assassination, the information was rewritten to show that there was a threat to President Lyndon Johnson, who succeeded President Kennedy.”
Bolden, who was 29 and idealistic, went public with his concern that the Secret Service did not adequately protect President Kennedy. He thought the truth would win out, but bureaucracy didn’t seek the truth; it sought to protect itself.