Summary

Rufus Wheeler Peckham Western Union Telephone Company v…

Can it be said that the imposition of a penalty for the violation of a duty which the company owed by the general law of the land is a regulation of or an obstruction to interstate commerce within the meaning of that clause of the federal constitution under discussion? We think not. No tax is laid upon any interstate message, nor is there any regulation of a nature calculated to at all embarrass, obstruct, or impede the company in the full and fair performance of its duty as an interstate sender of messages.
Source: Wikisource

Rufus Wheeler Peckham Western Union Telephone Company v…

No confusion, therefore, could be expected in carrying out within the limits of that state the provisions of the statute. It is true, it provides a penalty for a violation of its terms, and permits a recovery of the amount thereof irrespective of the question whether any actual damages have been sustained by the individual who brings the suit; but that is only a matter in aid of the performance of the general duty owed by the company. It is not a regulation of commerce, but a provision which only incidentally affects it.
Source: Wikisource

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