In 1973, a father complained to the FCC that his son had heard the George Carlin routine "Filthy Words" broadcast one afternoon over WBAI, a Pacifica Foundation FM radio station in New York City.
Pacifica received a sanction from the FCC, in the form of a letter of
reprimand, for allegedly violating FCC regulations which prohibited
broadcasting "indecent" material.
Holding
The U.S. Supreme Court upheld the FCC action in 1978, by a vote of 5 to 4, ruling that the routine was "indecent but not obscene". The Court accepted as compelling the government's interests in 1) shielding children from patently offensive material, and 2) ensuring that unwanted speech does not enter one's home. The Court stated that the FCC had the authority to prohibit such broadcasts during hours when children were likely to be among the audience, and gave the FCC broad leeway to determine what constituted indecency in different contexts.