Of the following laws,which one contributed most to union membership?

Question

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The Norris-LaGuardia Act of 1932 significantly contributed to union membership by limiting the power of federal courts to issue injunctions against non-violent labor disputes and making yellow-dog contracts (agreements between an employer and an employee in which the employee agrees not to join a labor union) unenforceable in court. This act provided more freedom for workers to organize and join unions, thereby boosting union membership.

Of the Following Laws,which One Contributed Most to Union Membership