Moe Berg

Morris Berg was an American professional baseball catcher and coach in Major League Baseball who later served as a spy for the Office of Strategic Services during World War II. He played 15 seasons in the major leagues, almost entirely for four American League teams, though he was never more than an average player and was better known for being "the brainiest guy in baseball." Casey Stengel once described Berg as "the strangest man ever to play baseball."