What law mandates that management bargain in good faith with labor unions over terms of employment, such as wages?

National labor relations act 1935

Explanation:

National Labor Relations Act ("NLRA") is a foundational statute of United State labor law in 1935 to protect the rights of employees and employers, to encourage collective bargaining, and to curtail certain private sector labor and management practices, which can harm the general welfare of workers, businesses and the U.S. economy.

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