Executive Order 6199 Regulating the Interstate Commerce of Petroleum.
By virtue of the authority vested in me by the Act of Congress entitled "An Act to encourage national industrial recovery, to foster fair competition, and to provide for the construction of certain useful public works, and for other purposes," approved June 16, 1933 (Public No. 67, 73d Congress), the transportation in interstate and foreign commerce of petroleum and the products thereof produced or withdrawn from storage in excess of the amount permitted to be produced or withdrawn from storage by any State law or valid regulation or order prescribed thereunder, by any board, commission, officer, or other duly authorized agency of a State, is hereby prohibited.
Franklin D. Roosevelt, Executive Order 6199 Regulating the Interstate Commerce of Petroleum. Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/208760