Babe Ruth
Ruth was becoming a star player. However, by 1919, Red Sox owner Harry Frazee was having problems with money. In 1920, the Red Sox sold Ruth to the New York Yankees for cash. Even though the Red Sox had won several World Series in the years before this, they would not win another one until 2004. Many baseball fans believed that the Red Sox had become "cursed" by trading Ruth, and called this the "Curse of the Bambino". (When the Red Sox finally did win a World Series in 2004, they beat the Yankees in the American League Championship to get there.)