Which of the following is illegal in the United States?

A) Right-to-work laws
B) Operating a closed shop
C) Collecting bargaining
D) Operating a union shop

Closed Shop

A place of employment where hiring is restricted to individuals who are members of a particular labor union.

Right-to-Work Laws

Legislation that prohibits union security agreements between companies and workers' unions, allowing individuals to work without the requirement to join the union or pay dues.