39 U.S. Code § 201. United States Postal Service
Provisions of section 4(a) of Pub. L. 91–375 effective within 1 year after Aug. 12, 1970, on date established therefor by the Board of Governors of the United States Postal Service and published by it in the Federal Register, see section 15(a) of Pub. L. 91–375, set out as an Effective Date note preceding section 101 of this title.