Final answer:
The Wagner Act, or the National Labor Relations Act of 1935, is the legislation that shaped management's disciplinary policies and led to the creation of the National Labor Relations Board (NLRB) to enforce labor provisions.
Step-by-step explanation:
The legislation which helped shape management's disciplinary policies and created the National Labor Relations Board (NLRB) for enforcement purposes was the Wagner Act, also known as the National Labor Relations Act of 1935. This act was instrumental in protecting the rights of workers to form unions and engage in collective bargaining practices with employers. Additionally, the Wagner Act led to the creation of the NLRB to enforce these labor provisions.
The Wagner Act was a critical part of the Second New Deal and reinforced principles that were initially introduced in the National Industrial Recovery Act (NIRA). However, when the NIRA was declared unconstitutional, the Wagner Act re-established the government's support for collective bargaining and union rights, thus playing a crucial role in the history of U.S. labor relations.