Much stress is put upon the evils which come from the struggle between employers and employees over the matter of wages, working conditions, the right of collective bargaining, etc., and the resulting strikes, curtailment and irregularity of production and effect on prices; and it is insisted that interstate commerce is greatly affected thereby.... The conclusive answer is that the evils are all local evils over which the Federal Government has no legislative control. The relation of employer and employee is a local relation. At common law, it is one of the domestic relations. The wages are paid for the doing of local work. Working conditions are obviously local conditions. The employees are not engaged in or about commerce, but exclusively in producing a commodity. And the controversies and evils, which it is the object of the act to regulate and minimize, are local controversies and evils affecting local work undertaken to accomplish that local result. Such effect as they may have upon commerce, however extensive it may be, is secondary and indirect. An increase in the greatness of the effect adds to its importance. It does not alter its character.[14] We all know how this issue was finally resolved. In the Fair Labor Standards Act of 1938 Congress not only prohibits interstate commerce in goods produced by substandard labor, but it directly forbids, with penalties, the employment of labor in industrial production for interstate commerce on other than certain prescribed terms. And in United States _v._ Darby[15] this Act was sustained by the Court, in all its sweeping provisions, on the basis of an opinion by Chief Justice Stone which in turn is based on Chief Justice Marshall's famous opinions in McCulloch _v._ Maryland and Gibbons _v._ Ogden rendered more than a century and a quarter ago. In short, as a principle capable of delimiting the national legislative power, the concept of Dual Federalism as regards the present Court seems today to be at an end, with consequent aggrandizement of national power.