In 1948 DeLoach replaced John Doherty as FBI's liaison officer to the Central Intelligence Agency. His main source of contact was Sheffield Edwards. According to Mark Riebling (Wedge) DeLoach had to persuade Frank Wisner to stop some of the CIA more outlandish operations. Riebling quotes Deloach as saying: "Guys, you can't do that. Your operation just won't work, it's gonna blow. People suspect you. They know damn well you're not defense. You aren't properly backstopped."
According to Ronald Kessler (The Bureau: The Secret History of the FBI), DeLoach attempted to blackmail Senator Carl T. Hayden, chair of the Senate Rules and Administration Committee, into following the instructions of J. Edgar Hoover. William C. Sullivan (The Bureau: My Thirty Years in Hoover's FBI) points out that Hoover selected DeLoach as his liaison to Lyndon B. Johnson when leader of the Senate.
DeLoach was involved in the investigation of the assassination of John F. Kennedy. In one memo sent to Clyde Tolson, DeLoach claimed that Lyndon B. Johnson "felt the CIA had something to do with the plot" to kill Kennedy. William C. Sullivan argued that by 1964 Deloach was a "member of Johnson's inner circle... and had a direct line to LBJ's White House". This included providing information from FBI files on Barry Goldwater during the presidential campaign of 1964.
In 1965 DeLoach was promoted to deputy director of the FBI. He held this position until he resigned in 1970 to work for Donald Kendall, who was a close friend of Lyndon Johnson.
In 1975 retired FBI Special Agent Arthur Murtagh testified before the House Select Committee on Intelligence about the time DeLoach told him: "The other night, we picked up a situation where this senator was seen drunk, in a hit-and-run accident, and some good-looking broad was with him. We got the information, reported it in a memorandum, and by noon the next day, the senator was aware that we had the information, and we never had trouble with him on appropriations since.
Cartha (Deke) DeLoach published Hoover's FBI in 1995.
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