In April 1950, the U.S. Atomic Energy Commission ordered "Scientific American" to cease publication of an issue containing an article by Hans Bethe that appeared to reveal classified information about the thermonuclear hydrogen bomb. Subsequent review of the material determined that the AEC had overreacted. The incident was important for the "new" "Scientific American"'s history, as the AEC's decision to burn 3000 copies of an early press-run of the magazine containing the offending material appeared to be "book burning in a free society" when publisher Gerard Piel leaked the incident to the press.