Covert Action and Clandestine Activities of the Intelligence Community: Selected Notification Requirements in Brief [May 7, 2018] [open pdf - 742KB]
"Covert action and clandestine activities of the intelligence community and activities of the military may appear similar, but they involve different notification requirements and usually are conducted under different authorities of the U. S. Code. The requirements for notifying Congress of activities of the intelligence community originated from instances in the 1970s when media disclosure of past intelligence abuses underscored reasons for Congress taking a more active role in oversight. Over time, these requirements were written into statute or became custom."
CRS Report for Congress, R45191