The Strike Caller is a job that involves three different roles. The first role is UMP, which stands for UMPIRE, a person who makes decisions on the field during a baseball game. The second role is UMPIRE, which stands for UNION member protection and industrial relations professional, a person who works to protect the rights of UNION members in the workplace. The third role is UNION, which stands for UNION organizer, a person who works to organize workers into unions and to negotiate better wages and working conditions for them. All three roles are important in ensuring that workers have fair and equitable working conditions.