Foul Callers are people who make calls in a sporting event that are deemed to be incorrect or unfair. Referees (REFS) and Umpires (UMPS) are the two main types of Foul Callers, as they are responsible for making decisions on the field or court. Referees are typically found in sports such as basketball, football, and hockey, while Umpires are usually found in baseball and softball. Both Referees and Umpires have the authority to make calls that can affect the outcome of a game.