Superman's Pal, Jimmy Olsen #102

In "Superman's Greatest Double-Cross!", Jimmy Olsen finds himself in over his head when a gangster named "Spade" Felton kidnaps him and forces him to reveal Superman’s secret identity. Furious at being outshone by Clark Kent once again, Jimmy lashes out in anger—and in a moment of reckless frustration, he gives up Clark’s name, unaware he’s just handed the villain the key to the Man of Steel’s true identity.