Summary

Byron White Lewis Publishing Company v. Morgan…

We come, then, to determine whether the provision as thus construed is valid. That Congress, in exerting its power concerning the mails, has the comprehensive right to classify which it has exerted from the beginning, and therefore may exercise its discretion for the purpose of furthering the public welfare as it understands it, we think it too clear for anything but statement; the exertion of the power, of course, at all times and under all conditions, being subject to the express or necessarily implied limitations of the Constitution.
Source: Wikisource

Byron White Lewis Publishing Company v. Morgan…

That the assailed provision in no sense can be considered as an attempted exertion of power to regulate the freedom of the press, or even as the exercise of the legislative authority to regulate the mails in the larger or general sense of that term, since, when rightly construed, the provision only deals with what is known as second-class mail matter, and imposes conditions necessary to be complied with to enable publishers to participate in the great and exclusive privileges and advantages which arise from the right to use the second-class mail.
Source: Wikisource

Byron White Lewis Publishing Company v. Morgan…

Because the provision is part of a postoffice appropriation act, and naturally, therefore, gives rise to the inference that it concerns the general subject of the mails, there being an precedent to entry, a penalty for the latter a surmise, if such a point of view could be indulged in under any circumstances, that Congress was intentionally exerting power not delegated to it, and consciously violating an express prohibition of the Constitution, and for that reason clothed its exertion of power in the disguise of postal legislation
Source: Wikisource

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