Summary

Portrait of Melville Fuller Melville Fuller United States v. E. C. Knight Company…

Commerce succeeds to manufacture, and is not a part of it. The power to regulate commerce is the power to prescribe the rule by which commerce shall be governed, and is a power independent of the power to suppress monopoly. But it may operate in repression of monopoly whenever that comes within the rules by which commerce is governed, or whenever the transaction is itself a monopoly of commerce.
Source: Wikisource

Portrait of Melville Fuller Melville Fuller United States v. E. C. Knight Company…

It cannot be denied that the power of a state to protect the lives, health, and property of its citizens, and to preserve good order and the public morals, 'the power to govern men and things within the limits of its dominion,' is a power originally and always belonging to the states, not surrendered by them to the general government, nor directly restrained by the constitution of the United States, and essentially exclusive.
Source: Wikisource

Portrait of Melville Fuller Melville Fuller United States v. E. C. Knight Company…

Again, all the authorities agree that, in order to vitiate a contract or combination, it is not essential that its result should be a complete monopoly; it is sufficient if it really tends to that end, and to deprive the public of the advantages which flow from free competition. Slight reflection will show that, if the national power extends to all contracts and combinations in manufacture, agriculture, mining, and other productive industries, whose ultimate result may affect external commerce, comparatively little of business operations and affairs would be left for state control.
Source: Wikisource

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