The predecessor to the AFL was the

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The Knights of Labor was a major labor organization in the late 19th century and was the predecessor to the American Federation of Labor (AFL). While there were other labor organizations that existed before the AFL, such as the International Workingmen's Association (also known as the First International) and the National Labor Union, they were not directly linked to the creation of the AFL. The other options listed are either later labor organizations or not directly connected to the AFL's founding.

The Predecessor to the AFL Was the