Harry Truman actually said...
Any person navigating an aircraft within any of these airspace reservations in violation of the provisions of this order will be subject to the penalties prescribed in the Civil Aeronautics Act of 1938 (52 Stat. 973), as amended.
Context
Executive Order 9925—Establishing Airspace Reservations Over Certain Facilities of the United States Atomic Energy Commission
01/16/1948