Description Major League Baseball (MLB) is a diverse sport played by athletes from around the world. But in the late 1800s and the first half of the 1900s, MLB was mostly segregated. Black players and coaches were not welcome. The Negro Leagues gave these players and coaches other options to play pro baseball. Meet unsung Negro Leagues stars such as Moses Fleetwood Walker and Toni Stone, and learn about the activists and heroes who helped integrate America's Pastime.