People of a certain age know the names Colson, Liddy, Hunt, Dean, Haldeman, Erlichman, Nixon and Watergate like they know the names of Santa’s reindeer and Snow White’s seven short roommates. The history and politics packed into those names had—and continue to have—a profound effect on how we think of the presidency and politics and our Constitution, and the ability of the latter to survive assaults from the former.

But one name crucial to the Watergate burglary investigation that eventually brought down a criminal president remained a secret, cloaked in tightly guarded mystery and...

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