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In a related vein, there is a book about the NSA (National Security Agency?) entitled
"The Puzzle Palace." The author has written a followup book too.

The existence of the NSA was denied for many years. Supposedly NSA stood for
"No Such Agency." Its budget is rumored to be larger than the CIA's. They are experts
at collecting "sigint" (signal intelligence gathered thru communications).
As contrasted with "humint" (human intelligence gathered from persons directly)

The NSA has the ability to intercept any form of communication on earth.

Since telephone calls can be digitized, the retrieval of data is now simplified by high
technology.

When a language specialist sits down in an office to listen to the calls of a target country's
movers and shakers, he has a group of photograph on his desk of these players. This enables
him to better visualize the men on the tape he is analyzing. Fascinating.

SIA