Flood v. Kuhn, 407 U.S. 258 (1972), was a United States Supreme Court decision upholding, by a 5–3 margin, the antitrust exemption first granted to Major League Baseball (MLB) in Federal Baseball Club v. National League. It arose from a challenge by St. Louis Cardinals' outfielder Curt Flood when he refused to be traded to the Philadelphia Phillies after the 1969 season. He sought injunctive relief from the reserve clause, which prevented him from negotiating with another team for a year after his contract expired. Named as initial respondents were baseball commissioner Bowie Kuhn, MLB and all of its then-24 member clubs.