columnist agent

基本解释

Vice President Dick Cheney's chief of staff, Scooter Libby, was actually indicted last year for perjury and obstruction of justice, not for naming the agent to a columnist--although the special prosecutor appears to have implied that Libby had done so--but for incorrectly recalling who had told him the name of the CIA agent.
FORBES: Fact and Comment
The newspaper columnist who broke the identity of a CIA agent, has now broken his own silence on the matter, after almost three years.
NPR: Novak Reveals Details of CIA Identity Leak