18 U.S.C. 1464
From Conservapedia
18 U.S.C. § 1464 is the law which gives the Federal Communications Commission the authority to police indecent speech on television and radio:
“ | "Whoever utters any obscene, indecent, or profane language by means of radio communication shall be fined under this title or imprisoned not more than two years, or both." | ” |