Cooper?
May 22, 2018 - When the CIA Infiltrated a Presidential Campaign
In 1975, then CIA Director William Colby told the House Select Committee on Intelligence that spying on Goldwater had been the brainchild of Tracy Barnes, head of the CIA’s Domestic Operations Division.
According to Colby’s version of events, Barnes proposed it to Chester L. Cooper, a CIA officer working in the Johnson White House on temporary assignment to the National Security Council.
https://www.politico.com/magazine/story/2018/05/22/cia-fbi-spy-presidential-campaign-trump-goldwater-218415