The World Series is the annual championship series of Major League Baseball (MLB) in the United States and Canada, and the workers involved in the event include Umpires. Umpires are responsible for making sure that the rules of the game are followed and that the players abide by them. They also make decisions on plays that are not clear-cut, such as whether a ball is fair or foul, and whether a runner is safe or out. Umpires also have the authority to eject players or coaches from the game if they are deemed to be in violation of the rules.