A more thorough explanation:

Hiring Hall

A hiring hall is a system or organization, usually run by a union, where employers can find workers to fill job openings. The union manages the process of referring workers to employers and ensures that workers are selected based on established criteria, such as seniority. This system is commonly used in industries with collective bargaining agreements.

For example, a construction company may need to hire workers for a new project. They would go to the hiring hall operated by the union representing the workers in that industry. The union would provide a list of available workers who meet the necessary qualifications, such as experience and training. The company would then select workers from the list and hire them for the project.

Another example is a shipping company that needs to hire longshoremen to load and unload cargo from ships. They would go to the hiring hall operated by the longshoremen's union. The union would provide a list of available workers who meet the necessary qualifications, such as physical strength and experience. The company would then select workers from the list and hire them for the job.

The examples illustrate how a hiring hall works in practice. Employers go to the hiring hall to find workers who meet the necessary qualifications for the job. The union manages the process of referring workers to employers and ensures that workers are selected based on established criteria, such as seniority or experience. This system helps to ensure that workers are treated fairly and that employers have access to a pool of qualified workers.