Daniel Ellsberg, who leaked classified documents around the Vietnam War known as the Pentagon Papers, has died at 92.
Mr Ellsberg, who had been diagnosed with inoperable pancreatic cancer in February, died at his home in California, his family said.
Long before WikiLeaks or Edward Snowden, the Pentagon Papers were one of the most famous leaks in history, a case fictionalised in the 2017 Steven Spielberg movie The Post.
The documents revealed long-time US government doubts and deceit about the Vietnam War and sparked a furious reaction by then US president Richard Nixon.
The military analyst became the target of a smear campaign by the White House, with the president's national security adviser, Henry Kissinger, calling Mr Ellsberg "the most dangerous man in America who must be stopped at all costs".
Mr Ellsberg, a Harvard graduate, was a long well-placed member of the government-military elite. He had been an early supporter of the Vietnam War - but changed his mind, and went on to denounce it publicly.
Then, he secretly went to the media in 1971 in hopes of expediting the end of the yearslong conflict.
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