Dr. Miles Medical Co. v. John D. Park and Sons Co.
From Conservapedia
In Dr. Miles Medical Co. v. John D. Park and Sons Co., 220 U.S. 373 (1911), the U.S. Supreme Court established that resale price maintenance is per se unlawful under Section of the Sherman Act.
This precedent was overruled in Leegin Creative Leather Prods. v. PSKS, Inc., 127 S. Ct. 2705 (2007).