Answer:
The correct answers is: Give firms the right to require a worker not to join a union as a condition of employment.
Step-by-step explanation:
A Yellow-dog contract is an illegal contract that contains employment agreements with the condition that workers could not join labor unions or if they were already in a union, they had to resign their memberships or lose their jobs.
It was believed that employers and their workers should be free to negotiate labor agreements between themselves without interference from the government.
Employers challenged labor union opposition to yellow dog contracts by asserting that the agreements were negotiable and workers were not forced to sign them. According to the unions, few workers who refused to sign the anti-union employment agreements were hired.
In the year 1932, the labor unions managed to get Congress to pass legislation, outlawing yellow dog contracts.