Crackled

[W]hen those rifles crackled over Dealey Plaza, in Dallas, Texas on November 22, 1963 and John F. Kennedy's brain was splattered across the road, they had made their move into the big time. They took over control of the President and of the Presidency. The man they had killed was no longer a problem and they had made certain that his successor, Lyndon Johnson, heard and remembered the sound of those guns. It is the sound of those guns in Dallas, and their ever-present threat, which is the real mechanism of control over the American government.
--L. Fletcher Prouty, 1975, author of "The Secret Team"