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Leo Ryan was the Democratic Congressman who went to South America to investigate Jim Jones and his cult. He was subsequently killed by the cult as he went back to his plane.
From a quick wiki glance, he was critical of the lack of Congressional oversight of the CIA, L. Ron Hubbard and Scientology, and the Unification Church of Sun Myung Moon.
So what if Leo Ryan had either not gone to Jonestown or had managed to avoid the cultists sent to kill him and his party?