The NSA's Hidden Spy Hubs in Eight U.S. Cities
Anthony Warnick
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T he secrets are hidden behind fortified walls in cities across the United States, inside towering, windowless skyscrapers and fortress-like concrete structures that were built to withstand earthquakes and even nuclear attack. Thousands of people pass by the buildings each day and rarely give them a second glance, because their function is not publicly known.

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