HENRY KISSINGER said he "must be stopped at all costs". Richard Nixon was more blunt: "We got to get this son of a bitch." And oh, how they tried, creating a team of operatives whose dirty tricks would eventually sink the president himself. But Daniel Ellsberg proved an elusive target, and anyway his work was already done. Forty years ago this week the New York Times began publishing the Pentagon Papers, the largest leak of classified documents in American history until Wiki-Leaks came along.
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