Answer is crafts union.
Craft union, trade union integrating people who are engaged in a certain craft or talent but may work for different companies and in different regions. Craft unions were formed in Britain and the United States in the middle of the nineteenth century to raise wage levels and working conditions.
Their dominance stems from their control over the supply of trained labor, which they retain through licensing and apprenticeship systems. A local craft union tries to organize all members of its trade by using slogans such as "One craft, one union" (e.g., plumbers, bricklayers, ironworkers, carpenters etc.)
Therefore, the answer is craft union.
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