The Black Sox Scandal was a Major League Baseball game-fixing scandal in which eight members of the Chicago White Sox were accused of throwing the 1919 World Series against the Cincinnati Reds in exchange for money from a gambling syndicate led by Arnold Rothstein. As a response, the National Baseball Commission was dissolved and Judge Kenesaw Mountain Landis was appointed to be the first Commissioner of Baseball, and given absolute control over the sport to restore its integrity.

Despite acquittals in a public trial in 1921, Judge Landis permanently banned all eight men from professional baseball. The punishment was eventually defined by the Baseball Hall of Fame to include banishment from consideration for the Hall. Despite requests for reinstatement in the decades that followed (particularly in the case of Shoeless Joe Jackson), the ban remained.

The Commissioner of Baseball is the chief executive officer of Major League Baseball (MLB) and the associated Minor League Baseball (MiLB) – a constellation of leagues and clubs known as "organized baseball". Under the direction of the Commissioner, the Office of the Commissioner of Baseball hires and maintains the sport's umpiring crews, and negotiates marketing, labor, and television contracts. The commissioner is chosen by a vote of the owners of the teams. The incumbent MLB commissioner is Rob Manfred, who assumed office on January 25, 2015.