"The constitutional principles underlying the administration of the Post Office Department were discussed in the opinion of the court in , in which we held that the power vested in Congress to establish post offices and post roads embraced the regulation of the entire postal system of the country; that Congress might designate what might be carried in the mails and what excluded . . . . It may . . . refuse to include in its mails such printed matter or merchandise as may seem objectionable to it upon the ground of public policy . . . . For more than thirty years not only has the transmission of obscene matter been prohibited, but it has been made a crime, punishable by fine or imprisonment, for a person to deposit such matter in the mails. The constitutionality of this law we believe has never been attacked. . . ."


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