Ashcroft v. Free Speech Coalition
Ashcroft v. Free Speech Coalition, 535 U.S. 234 (2002), is a U.S. Supreme Court case that struck down two overbroad provisions of the Child Pornography Prevention Act of 1996 because they abridged "the freedom to engage in a substantial amount of lawful speech".
Source: Wikipedia — Ashcroft v. Free Speech Coalition (CC BY-SA 4.0)