Do you think it is right for a union and an employer to agree in a collective ba

Do you think it is right for a union and an employer to agree in a collective bargaining agreement that all of the workers subject to the collective bargaining agreement have to join the union in order to keep their job?
Did the Great Depression have any impact on the U.S. labor movement? If so, what?
Describe the federal and court actions against union workers in the 1800s.