Aspects of this topic are discussed in the following places at Britannica.
...based largely on information from an unnamed source called “Deep Throat.” The mysterious identity of Deep Throat became a news story in its own right and led to decades of speculation. (W. Mark Felt, a top-ranking FBI official at the time of the investigation, revealed himself as the informant in 2005.) In February 1973 a special Senate committee—the Select Committee on...
in Watergate Scandal )...Woodward and Carl Bernstein received leaked information from a source that was nicknamed “Deep Throat”; after decades of conjecture, the identity of the source was revealed in 2005 as W. Mark Felt, who was, at the time of the leak, deputy director of the Federal Bureau of Investigation.
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