I’ve seen a whole host of footage over the years of the JFK assassination, as have most people. This one actually tells you the story.
From wikipedia’s file of John Edgar Hoover, Head of the FBI –
Hoover personally directed the FBI investigation into the assassination of President John F. Kennedy. The House Select Committee on Assassinations issued a report in 1979 critical of the performance by the FBI, the Warren Commission as well as other agencies. The report also criticized what it characterized as the FBI’s reluctance to thoroughly investigate the possibility of a conspiracy to assassinate the president