Daniel Ellsberg in the context of "Harvard Society of Fellows"

The Pentagon Papers, officially titled Report of the Office of the Secretary of Defense Vietnam Task Force, is a United States Department of Defense history of the United States' political and military involvement in Vietnam from 1945 to 1968. Released by Daniel Ellsberg, who had worked on the study, it was made public on the front page of The New York Times in 1971. A 1996 article in The New York Times said that the Pentagon Papers had demonstrated, among other things, that Lyndon B. Johnson's administration had "systematically lied, not only to the public but also to Congress".

The Pentagon Papers revealed that the U.S. had secretly enlarged the scope of its actions in the Vietnam War with coastal raids on North Vietnam and Marine Corps attacks—none of which were reported in the mainstream media. For his disclosure of the Pentagon Papers, Ellsberg was initially charged with conspiracy, espionage, and theft of government property; these charges were later dismissed, after prosecutors investigating the Watergate scandal discovered that staff members in the Nixon White House had ordered the so-called White House Plumbers to engage in unlawful efforts to discredit Ellsberg.

The White House Plumbers, sometimes simply called the Plumbers, the Room 16 Project, ODESSA or more officially, the White House Special Investigations Unit, was a covert White House Special Investigations Unit, established within a week of the publication of the Pentagon Papers in June 1971, during the presidency of Richard Nixon. Its task was to stop and/or respond to the leaking of classified information, such as the Pentagon Papers, to the news media. The work of the unit "tapered off" after the bungled "Ellsberg break-in" but some of its former operatives branched into illegal activities while still employed at the White House together with managers of the Committee for the Re-Election of the President, including the Watergate break-in and the ensuing Watergate scandal. The group has been described as Nixon's "fixers".