POLITICS
11/21/2013 08:36 pm ET

Obscure FBI Unit Does The Domestic Spying That The NSA Can't

BRENDAN SMIALOWSKI via Getty Images

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.

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