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…
An intelligence document marked HCS will contain details about the source of the information. Often such descriptions are very general, noting if a “clandestine source” has direct or secondary knowledge of the intelligence presented. But sometimes there are more direct descriptions to help policymakers properly assess the information, details that could allow people reading the document to identify the source — a prime reason the spy agency seeks to tightly control HCS documents.
The HCS designation is “used to protect exceptionally fragile and unique” human intelligence operations and methods “that are not intended for dissemination outside of the originating agency,” according to a 2013 directive from the Office of the Director of National Intelligence.
According to former officials, documents marked HCS have special handling requirements to make sure they are stored properly and not reviewed by people who are not cleared to see them.
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