Defense Production Act of 1950 and the 1953 amendment to it authorize the President to require acceptance and performance of such contracts or orders as he deems necessary or appropriate to promote the national defense.[362] _Protection of Quality_: Only one example in this category has been discovered. In 1940 Congress amended an old World War I law, vintage 1918, that provided punishment for the willful injury or destruction of war materials or war premises used in connection with war material.[363] Sections 5 and 6 of this Act imposed maximum penalties of $10,000 fine and ten years imprisonment for willfully injuring or destroying national defense materials, whatever they might be, premises or utilities, or willfully making defective defense material or equipment utilized for the production of defense material. An important element of the offense was existence of an intent to injure, interfere with, or obstruct the national defense of the United States.[364] While laws against sabotage have been enforced vigorously, this 1918 law was designed to protect the Government against shoddy workmanship and poor equipment. _Controlling Labor Relations_: Emergency provisions regulating labor relations in private enterprise appear to have four different motivations. First, wide scale control of the relations between employers and employees may constitute an integral part of a total program aimed at countering an economic depression. Second, it may be aimed at preventing unethical practices. Third, the purpose may be to avoid interruption of vital production. And, fourth, the control may be designed as a precaution against espionage, sabotage, or other violation of the national security.