Maintenance of membership shop is a form of union security. There is maintenance of membership shop when employees, who are union members as of the effective date of the agreement, or who thereafter become members, must maintain union membership as a condition for continued employment until they are promoted or transferred out of the bargaining unit or the agreement is terminated.

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.