Effectively, he has been a spy — but for the United States. For the first time, BuzzFeed News has verified the surprising sweep of Sater’s undercover work and many of his specific exploits. He worked as an asset for the CIA and the Defense Intelligence Agency (or DIA) and tracked Osama bin Laden. Then he worked for more than a decade for the FBI, providing intel on everything from the mob to North Korea’s drive for nuclear weapons. He still operates as a source for the bureau, according to two current FBI agents.
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