Closed-shop is a form of union security. A closed-shop may be defined as an enterprise in which, by agreement between the employer and his employees or their representatives, no person may be employed in any or certain agreed departments of the enterprise unless he or she is, becomes, and, for the duration of the agreement, remains a member in good standing of a union entirely comprised of or of which the employees in interest are a part.

Caveat: Subsequent court and administrative rulings, or changes to, or repeal of, laws, rules and regulations may have rendered the whole or part of this article inaccurate or obsolete.