In 1971, the New York Times published one of the most important leaks in US history - 7000 pages of top-secret Defence Department documents known as the Pentagon Papers.
The Papers were leaked by a Pentagon analyst called Daniel Ellsberg in an attempt to end the Vietnam War.
He tells his story to Witness.
(Photo: Daniel Ellsberg in the 1970s Credit: Hulton Archive / Getty Images)
Published on Monday, 11th June 2012.
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