The commissioner of baseball is the chief executive officer of Major League Baseball and the associated Minor League Baseball – a constellation of leagues and clubs known as "affiliated baseball". Und
Flood v. Kuhn, 407 U.S. 258, was a decision by the Supreme Court of the United States that preserved the reserve clause in Major League Baseball players' contracts. By a 5–3 margin, the Court reaffirm
William Hulbert instituted the reserve system in the National League in 1879.
Ned Hanlon took MLB to court for antitrust violations in Federal Baseball Club v. National League.