Images: AP/AFP/Getty Images/Reuters/Zuma Press Composite: Mark KellyThe assassination of President John F. Kennedy on Nov. 22, 1963, shocked the nation. It brought justifiable scrutiny on the law enforcement agencies that should have prevented it as well as those that investigated it. One lesson law enforcement learned from Dallas and its aftermath is how not to investigate an assassination. The Kennedy investigation devolved into a fiasco. The Federal Bureau of Investigation, the Secret Service, the Dallas police and sheriff offices all argued with each other.

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Persons: Kim Strassel, Kyle Peterson, Mary O'Grady, Dan Henninger, Mark Kelly The, John F, Kennedy, Warren Commission’s, Lee Harvey Oswald, Oswald Organizations: Getty, Zuma, Texas, Federal Bureau of Investigation, Service, Dallas Locations: Dallas