With every fresh leak, the world learns more about the U.S. National Security Agency's massive and controversial surveillance apparatus. Lost in the commotion has been the story of the NSA's indispensable partner in its global spying operations: an obscure, clandestine unit of the Federal Bureau of Investigation that, even for a surveillance agency, keeps a low profile.
When the media and members of Congress say the NSA spies on Americans, what they really mean is that the FBI helps the NSA do it, providing a technical and legal infrastructure that permits the NSA, which by law collects foreign intelligence, to operate on U.S. soil. It's the FBI, a domestic U.S. law enforcement agency, that collects digital information from at least nine American technology companies as part of the NSA's Prism system. It was the FBI that petitioned the Foreign Intelligence Surveillance Court to order Verizon Business Network Services, one of the United States' biggest telecom carriers for corporations, to hand over the call records of millions of its customers to the NSA.