Swipe is a comics term for the intentional copying of a cover, panel, or page from an earlier comic book or graphic novel without crediting the original artist. Artists Jack Kirby, Neal Adams, Hergé, and Jim Lee are common targets of swipes, though even those artists may not be above reproach; Kirby was known to have swiped from Hal Foster early in his career. Similarly, many Golden Age artists kept "swipe files" of material to be copied as needed. Certain contemporary artists have become notorious for their swiping, including Rich Buckler (who favors Neal Adams and Jack Kirby), Rob Liefeld (many artists), Keith Giffen (José Antonio Muñoz), and Roger Cruz (Jim Lee and Joe Madureira).