The term 'Ballfield Arbiters' refers to the job of Umpires (4 letters). Umpires are responsible for officiating baseball games, ensuring that the rules are followed and making decisions on the field. They are responsible for calling balls and strikes, fair and foul balls, and other rulings during the game. Umpires also have the authority to eject players or coaches from the game if necessary. Umpires must have a thorough knowledge of the rules of the game and be able to make quick decisions in order to ensure the game is played fairly.