The process of killing President Kennedy and covering up the conspiracy relied on parties whom the plotters knew in advance they could count on to enter into a conspiracy of silence. Those few witnesses who courageously broke the silence, such as Dr. Charles Crenshaw, suffered the consequences of being isolated and singled out. But the Dallas and Bethesda doctors who changed their testimony under stress, who lied out of fear for their lives, or who followed orders in not probing wounds and then stonewalling questions, were not alone. They joined in a larger conspiracy of silence that would
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