Impact of New Deal Legislation on Labor Relations

During the 1930s, the New Deal was implemented as a series of economic programs designed to alleviate the suffering caused by the Great Depression. While these programs aimed at relief, recovery, and reform, they also had lasting impacts on the federal government's role in the economy and society. One significant aspect of the New Deal was its approach to labor relations, which fostered a new era of unionization and workers' rights. This shift prompted both support and criticism across various sectors of American society.

Which of the following pieces of legislation enacted during the New Deal had the most profound impact on the relationship between the federal government and organized labor?