The only national labor union to survive the post-Civil War period was the

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The American Federation of Labor (AFL) was the only national labor union to survive the post-Civil War period. The National Labor Union (NLU), formed in 1866, had collapsed by the 1870s due to various factors, including internal divisions and opposition from employers and government officials. The Knights of Labor, formed in 1869, experienced rapid growth in the 1880s but declined by the end of the decade due to a series of failed strikes and the backlash from the Haymarket Riot in 1886. The Knights of Columbus, on the other hand, is a Catholic fraternal organization and not a labor union. The Congress of Industrial Organizations (CIO) was formed in the 1930s and merged with the AFL in 1955.

The Only National Labor Union to Survive the Post-Civil War