2 at F.B.I . '' -LRB- front page , June 1 -RRB- : The patriot who informed the Washington Post reporters Carl Bernstein and Bob Woodward of ways to research information that resulted in the exposure of the Watergate break-in of the Democratic National Committee headquarters and subsequent crimes of cover-up and misuse of power is W. Mark Felt , then the No . 2 official at the Federal Bureau of Investigation .