Title 50 : Section 421

"Defy [me] to quote a law to the contrary"? Ok...

Whoever, having or having had authorized access to classified information that identifies a covert agent, intentionally discloses any information identifying such covert agent to any individual not authorized to receive classified information, knowing that the information disclosed so identifies such covert agent and that the United States is taking affirmative measures to conceal such covert agent's intelligence relationship to the United States, shall be fined under title 18 or imprisoned not more than ten years, or both.