As used in this chapter— (1) “ penalty mail ” means official mail, other than franked mail, which is authorized by law to be transmitted in the mail without prepayment of postage; (2) “ penalty cover ” means envelopes, wrappers, labels, or cards used to transmit penalty mail; (3) “ frank ” means the autographic or facsimile signature of persons authorized by sections 3210–3216 and 3218 of this title to transmit matter through the mail without prepayment of postage or other indicia contemplated by sections 733 and 907 of title 44; (4) “ franked mail ” means mail which is transmitted in the mail under a frank; (5) “Members of Congress ” includes Senators, Representatives, Delegates, and Resident Commissioners; and (6) “ missing child ” has the meaning provided by section 403(1) of the Juvenile Justice and Delinquency Prevention Act of 1974 . ( Pub. L. 91–375 , Aug. 12, 1970 , 84 Stat. 751 ; Pub. L. 99–87, § 1(b) , Aug. 9, 1985 , 99 Stat. 291 .) Editorial Notes References in Text Section 403 of the Juvenile Justice and Delinquency Prevention Act of 1974 , referred to in par. (6), is section 403 of Pub. L. 93–415 , which is classified to section 11292 of Title 34 , Crime Control and Law Enforcement. Amendments 1985—Par. (6). Pub. L. 99–87 added par. (6). Statutory Notes and Related Subsidiaries Effective Date Section effective July 1, 1971 , pursuant to Resolution No. 71–9 of the Board of Governors. See section 15(a) of Pub. L. 91–375 , set out as a note preceding section 101 of this title . CFR Title Parts 39 20 , 111 , 113