At the urging of Senator owner Clark Griffith, the other American League owners enact a rule prohibiting the league’s pennant winner from buying, selling or trading players during the following season. The winter meeting decision appears to have the desired effect as the Yankees finish in third place.

On December 7, 1939 — At the urging of Senator owner Clark Griffith, the other American League owners enact a rule prohibiting the league’s pennant winner from buying, selling or trading players during the following season. The winter meeting decision appears to have the desired effect as the Yankees finish in third place.

Sources:
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