33 Thomas Street. The Top Secret [NSA] Manhattan Building Hidden in Plain Sight.
(theculturetrip.com)
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This goes back a lot longer. The earliest of American SIGINT agencies, The Black Chamber, was founded in the early 1900s and was used to spy on the League of Nations conference in San Francisco. It is the grandfather of CIA and NSA. They had standing relationships and back doors w the telegraph and early telephone companies.