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Mark Felt

The Nixon White House hired a shadowy group called the Plumbers to prevent news leaks. But instead, an illegal break-in by the Plumbers inspired a source nicknamed Deep Throat to help the Washington Post. Three decades later, Deep Throat was identified as FBI No. 2 man Mark Felt. Before that, speculation pointed to a dozen or more people, including Pat Buchanan, Henry Kissinger, President George H.W. Bush, Gerald Ford, Gen. Alexander Haig, Sen. Lowell Weicker, Diane Sawyer and even comedian Ben Stein. Justin Sullivan, Getty Images
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