The White House Plumbers, sometimes simply called
the Plumbers, were a covert White House Special
Investigations Unit established July 24, 1971 during the presidency
of Richard Nixon. Its task was to stop the leaking of classified
information to the news media. Its members branched into illegal
activities working for the Committee to Re-elect the President,
including the Watergate break-in and the ensuing Watergate scandal.
(Source: Wikipedia)