Answer:
Option: A. outlawed the closed shop.
Step-by-step explanation:
The Taft- Hartley Act was also known as the labour-management Relations Act, which implemented in 1947 in America. The Act signed by President Harry S. Truman aftermath of the labor strikes in 1945 and 1946. The law made sure to outlawing unions from engaging in several illegal practices which included strikes, boycotts, picketing, closed shops, and donations to political campaigns. The closed shops was a union security arrangement under which the company agrees to hire union members only, and workers must remain under the union to continue working. The closed shops were outlawed in 1947 and considered to be illegal under the Supreme Court.