There was a rule added to baseball about making a "mockery of the game" for sending a midget in to pinch-hit, and having nearly no strike zone, he walked on four balls.
> American League president Will Harridge, saying Veeck was making a mockery of the game, voided Gaedel's contract the next day. In response, Veeck threatened to request an official ruling on whether Yankees shortstop and reigning American League MVP Phil Rizzuto, who stood 5 feet 6 inches (1.68 m), was a short ballplayer or a tall dwarf.
> He received confirmation of his qualification for the games while working as a plasterer and temporarily residing in a Finnish mental hospital, due to lack of funds for alternative accommodation rather than as a patient.
> American League president Will Harridge, saying Veeck was making a mockery of the game, voided Gaedel's contract the next day. In response, Veeck threatened to request an official ruling on whether Yankees shortstop and reigning American League MVP Phil Rizzuto, who stood 5 feet 6 inches (1.68 m), was a short ballplayer or a tall dwarf.
https://en.wikipedia.org/wiki/Eddie_Gaedel