Essential to breaking the Watergate case was the testimony before the Ervin committee of White House legal counsel:

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The White House legal counsel who testified before the Ervin committee and played a crucial role in breaking the Watergate case was John Dean. Dean provided information about the cover-up and implicated high-ranking officials, including President Nixon, in the scandal. His testimony helped lead to the discovery of the secret tapes that ultimately confirmed Nixon's role in the Watergate break-in and cover-up.

Essential to Breaking the Watergate Case Was the Testimony Before