Which labor groups organized first during the Progressive Era to agitate on behalf of their interests?

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Skilled workers like craftsmen organized first during the Progressive Era through unions such as the American Federation of Labor (AFL), which focused on improving wages and working conditions for their members. Unskilled workers like laborers also began to organize later in the era, while trade association professionals like teachers tended to form professional organizations rather than labor unions.

Which Labor Groups Organized First During the Progressive Era to Agitate