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The National Labor Union (NLU) was the first national labor federation in the United States. Founded in 1866 and dissolved in 1873,^[1] it paved the way for other organizations, such as the Knights of Labor and the AFL (American Federation of Labor). It was led by William H. Sylvis and Andrew Cameron.

The National Labor Union (NLU) followed the unsuccessful efforts of labor activists to form a national coalition of local trade unions. The NLU sought instead to bring together all of the national labor organizations in existence, as well as the "eight-hour leagues" established to press for the eight-hour day, to create a national federation that could press for labor reforms and help found national unions in those areas where none existed. The new organization favored arbitration over strikes and called for the creation of a national labor party as an alternative to the two existing parties.

The NLU drew much of its support from construction unions and other groups of skilled employees but also invited the unskilled and farmers to join. On the other hand, it campaigned for the exclusion of Chinese workers from the United States and made only halting, ineffective efforts to defend the rights of women and Black people. African-American workers established their own Colored National Labor Union as an adjunct, but their support of the prevalent racism of the citizens of the United States limited its effectiveness.

The NLU achieved early success, but one that proved less significant in practice. In 1868, Congress passed the statute for which the Union had campaigned so hard, providing the eight-hour day for government workers. Many government agencies, however, reduced wages at the same time that they reduced hours. While President Grant ordered federal departments not to reduce wages, his order was ignored by many. The NLU also obtained similar legislation in a number of states, such as New York and California, but discovered that loopholes in the statute made them unenforceable or ineffective.

In early 1869, the Chicago Tribune boasted that the NLU had 800,000 members; Sylvis himself put the figure at only 600,000. Both of these figures turned out to be greatly exaggerated.^[2] The organization was spectacularly unsuccessful at the polls and lost virtually all of its union supporters, many of whom moved on to the newly formed Knights of Labor. The depression of the 1870s, which drove down union membership generally, was one of the final factors contributing to the end of the NLU, the other being the dismantling of policies instituted during Radical Reconstruction.

By the 1870s the organisation increasingly relied on political action to meet its goals and in 1872 transformed itself into the National Labor Reform Party.

The NLRP nominated David Davis of Illinois, associate justice of the U.S. Supreme Court, as its presidential candidate for the upcoming presidential election. Davis later, however, withdrew his candidacy and the party made a poor showing at the polls. After holding one last convention in 1873, the National Labor Union collapsed and dissolved.

• Labor federation competition in the U.S.
• International Workingmen's Association in America

• Philip S. Foner History of the Labor Movement in the United States. Vol. 1: From Colonial Times to the Founding of the American Federation of Labor. New York: International Publishers, 1947.