What labor law did congress pass in 1868 because of the efferts of the NLU?

In 1868, Congress passed the Eight-Hour Act, which aimed to establish an eight-hour workday for federal employees. This legislation was influenced by the efforts of the National Labor Union (NLU), which advocated for improved labor conditions and workers' rights. While the act initially applied only to federal workers, it marked a significant step towards recognizing the importance of labor reform in the United States.