Appellants challenge the constitutionality of Title III of the Postal Revenue and Federal Salary Act of 1967, 81 Stat. 645, 39 U. S. C. § 4009 (1964 ed., Supp. IV), under which a person may require that a mailer remove his name from its mailing lists and stop all future mailings to the householder. The appellants are publishers, distributors, owners, and operators of mail order houses, mailing list brokers, and owners and operators of mail service organizations whose business activities are affected by the challenged statute.

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