How Classified Information Is Handled Presidents have established and developed the classification system through a series of executive orders around World War II and the early Cold War.
Renovated C.I.A. and N.S.A. Museums Offer a Peek at Spy Secrets — for Some The Central Intelligence Agency and the National Security Agency both recently overhauled their showcases of espionage.
Trump Inquiry Fueled in Part by Concern Over Intelligence Sources Documents related to the work of clandestine sources are some of the most sensitive and protected in the government. F.B.I. agents found some in boxes retrieved from Donald J. Trump’s home.