In 1971, Egil "Bud" Krogh was summoned to a closed-door meeting by John Ehrlichman, his mentor and key confidant of President Richard Nixon, in a secluded office in the Western White House. Krogh thought he was walking into a meeting to discuss the drug control program launched on his most recent trip to South Vietnam. Instead, he was handed a file and the responsibility for the SIU, Special Investigations Unit, later to become notorious as "The Plumbers." The unit was to investigate the leaks of top-secret government documents, particularly the Pentagon Papers, to the press. The president considered this task critical to national security. Nixon said he wanted the unit headed up by a "real son of a bitch." He got the studious, zealous, and loyal-to-a-fault Bud Krogh instead.