United States v. American Library Ass'n
United States v. American Library Association, 539 U.S. 194 (2003), was a decision in which the United States Supreme Court ruled that the United States Congress has the authority to require public schools and libraries receiving E-Rate discounts to install web filtering software as a condition of receiving federal funding, as required in the Children's Internet Protection Act of 2000.
Source: Wikipedia — United States v. American Library Ass'n (CC BY-SA 4.0)