No. 55 (hereafter Mail Box) draws into question the constitutionality of 39 U. S. C. § 4006 (now 39 U. S. C. § 3006, Postal Reorganization Act,[†] 84 Stat. 747), under *412 which the Postmaster General, following administrative hearings, may halt use of the mails and of postal money orders for commerce in allegedly obscene materials. No. 58 (hereafter Book Bin) also draws into question the constitutionality of § 4006, and, in addition, the constitutionality of 39 U. S. C. § 4007 (now 39 U. S. C. § 3007), 84 Stat. 748, under which the Postmaster General may obtain a court order permitting him to detain the defendant's incoming mail pending the outcome of § 4006 proceedings against him.

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