Jackie Mitchell's professional debut was on 4/2/31 in an exhibition game between the Chattanooga Lookouts (Mitchell's team) and the New York Yankees.
Mitchell, 17, had just recently signed with the Lookouts and pitched to just three batters in the game. Mitchell struck out Babe Ruth and Lou Gehrig before walking Tony Lazzeri.
After this performance, MLB Commissioner Kenesaw Mountain Landis cancelled Mitchell's contract with the Lookouts, effectively preventing Mitchell from having any chance playing Major League baseball.
Question: Why did Landis cancell Mitchell's contract?
Answer on this page (3/4 down)