All workers must join the union within 30 days after employment in a

A) union shop.
B) closed shop.
C) craft union.
D) business union.

Union Shop

All employees must join the union, usually within 30 days after they are hired.

Closed Shop

An employer may hire only union members; outlawed under the Taft-Hartley Act.

Craft Union

A labor organization representing workers who practice the same craft or trade, aiming to negotiate better wages, conditions, and rights for its members.