term:

Union Shop

union shop n

: a unionized business in which the employer by agreement is free to hire nonmembers as well as members of the union but union membership within a specified time (as 30 days) is a condition of continued employment compare agency shop, closed shop, open shop NOTE: State law determines whether a collective bargaining agreement can have a clause creating a union shop. Many states having right-to-work laws bar union shop agreements.

Source: Merriam-Webster's Dictionary of Law ©1996. Merriam-Webster, Incorporated. Published under license with Merriam-Webster, Incorporated.