Which act gives workers the right to organize a union?

The Wagner Act, also known as the National Labor Relations Act (NLRA), was enacted in 1935 and is pivotal in American labor history as it guarantees workers the right to organize and join unions. This act was designed to protect the rights of employees in the private sector, allowing them to engage in collective bargaining to obtain favorable working conditions and terms of employment. It established the National Labor Relations Board (NLRB) to oversee and protect these rights, ensuring that workers can unionize without interference or coercion from employers.

The other acts mentioned either do not pertain specifically to labor rights or focus on different aspects of employee welfare. For example, the Fair Labor Standards Act primarily addresses wage and hour laws, while the Employment Rights Act tends to cover various employment rights rather than union organization specifically. The National Security Act is unrelated to labor organization, focusing instead on national security and defense matters. Thus, the Wagner Act is the correct answer as it directly empowers workers to form and join unions.