Marvin Miller never played professional sports but had one of the biggest impacts on professional athletes. As the head of the Major League Baseball Players Association, Miller negotiated the first collective bargaining agreement in professional sports history in 1968. He supported Curt Flood's lawsuit for free agency and established salary arbitration, dramatically increasing players' salaries. His biggest achievement was helping to eliminate the reserve clause in 1975, making players true free agents. Since then, professional athlete salaries have skyrocketed. Miller fundamentally changed the player-owner relationship and empowered players, making him deserving of the Baseball Hall of Fame according to many.