18 U.S. Code [§ 1718. Repealed. Pub. L. 101–647, title XII, § 1210(c), Nov. 29, 1990, 104 Stat. 4832]

Section, acts June 25, 1948, ch. 645, 62 Stat. 782; Aug. 12, 1970, Pub. L. 91–375, § 6(j)(28), 84 Stat. 780, provided that libelous matter on wrappers or envelopes was nonmailable.