Curt Flood was a star center fielder for the St. Louis Cardinals who refused to be traded to the Philadelphia Phillies in 1969, instead filing a lawsuit against Major League Baseball alleging that the reserve clause in player contracts violated antitrust law. While the Supreme Court ultimately ruled against Flood, his challenge helped pave the way for free agency in baseball by establishing the "Curt Flood Rule" allowing players with over 10 years in the MLB to veto trades. After his playing career, Flood remained an advocate for players' rights and against the reserve clause until his death in 1997.