But documents retrieved from him in January included some marked “HCS,” for Human Intelligence Control System. Such documents have material that could possibly identify C.I.A. informants, meaning a general, sweeping declassification of them would have been, at best, misguided.
“HCS information is tightly controlled because disclosure could jeopardize the life of the human source,” said John B. Bellinger III, a former legal adviser to the National Security Council in the George W. Bush administration. “It would be reckless to declassify an HCS document without checking with the agency that collected the information to ensure that there would be no damage if the information were disclosed.”
C.I.A. espionage operations inside numerous hostile countries have been compromised in recent years when the governments of those countries have arrested, jailed and even killed the agency’s sources.
Last year, a top-secret memo sent to every C.I.A. station around the world warned about troubling numbers of informants being captured or killed, a stark reminder of how important human source networks are to the basic functions of the spy agency.
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