Benny Leonard was arguably the greatest lightweight champion of all time. With superb boxing skills and potent punching power, he fought over 200 times and suffered just five defeats. He spent his boyhood in a crime-ridden ghetto in Manhattan's Lower East Side and was the greatest of a long line of Jewish boxers to emerge from the slums. Leonard was still only 19 when he knocked out Freddie Welsh to become world lightweight king in 1917. He defended...