On April 18, 1939 — The five-year ban on broadcasting games played by the New York major league teams ends when Red Barber, hired away from the Reds by Larry McPhail, calls Brooklyn’s 7-3 loss to the Giants at Ebbets Field. In 1934, the two National League teams and the Yankees agreed not to air their games on the radio, fearing the exposure would reduce the number of fans attending games.

Source:
National Pastime

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