The world can finally get a deeper look at the long-hidden roots of American espionage as tens of thousands of once-secret documents have been made public covering the history of the Pond — a U.S. spy operation that used informers including a French serial killer and that remained shrouded in secrecy for more than 50 years.

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Long Shrouded in Secrecy, Details Emerge on Spy Agency Called ‘The Pond’