All of the following are provisions of the National Labor Relations Act EXCEPT:

The National Labor Relations Act (NLRA), also known as the Wagner Act, primarily focuses on protecting the rights of employees to organize and engage in collective bargaining. It establishes the legal framework for labor unions and outlines the rights of workers in relation to union activities and collective actions.

The correct choice highlights that the NLRA does not specifically require employers to provide workplaces that are free from foreseeable safety and health hazards. While workers' safety is indeed a crucial aspect of labor law, this responsibility falls under the jurisdiction of other legislation, specifically the Occupational Safety and Health Administration (OSHA), which is tasked with ensuring safe and healthful working conditions.

The other provisions mentioned in the question—such as the rights of employees to join unions, protection of collective bargaining rights, and prohibition of unfair labor practices—are all fundamental components of the NLRA. These rights and protections are designed to empower workers in their efforts to organize, negotiate, and secure advantageous conditions of employment.