Referee

A referee is an official, in a variety of sports and competition, responsible for enforcing the rules of the sport, including sportsmanship decisions such as ejection. The official tasked with this job may be known by a variety of other titles depending on the sport, including umpire, judge, arbiter (chess), commissaire, or technical official (by the International Olympic Committee). Referees may be assisted by umpires, linesmen, timekeepers, touch judges, or video review officials.