In 1947 Jackie Robinson broke baseball's color barrier and became a hero for black and white Americans, yet Robinson was a Negro League player before he integrated Major League baseball. Negro League ballplayers had been thrilling black fans since 1920. Among them were the legendary pitchers Smoky Joe Williams, whose fastball seemed to "come off a mountain top," Satchel Paige, the ageless wonder who pitched for five decades, and such hitters as Josh...