Final answer:
The role of chief administrator of the union hiring hall in a craft union is the business agent. The correct answer is d.
Step-by-step explanation:
The position in a craft union where the holder is the chief administrator of the union hiring hall is known as the business agent. This role is critical within the union structure, as it involves overseeing the hiring process, representing the union in negotiations with employers, and often managing day-to-day union affairs.
The business agent plays a key part in ensuring fair labor practices and is essential in maintaining the union's power within the labor market. Unlike the union president, shop steward, or committee chairman, who have different roles within the union's hierarchy.
The business agent's primary focus is on employment opportunities for union members, making this position particularly important in protecting the interests of the membership.