Answer:
The Knights of Labor
Explanation:
In the late nineteenth century, the Knights of Labor attempted to organize workers of all kinds into a union to improve working hours and conditions for laborers.
The Knights of Labor was an exceptionally progressive organization for its day. Most earlier unions restricted membership to skilled laborers (those with specialized training in a craft) and to white men.
Knights welcomed unskilled, semi-skilled, and skilled workers into their ranks. Immigrants, African Americans and women were also welcome as members.
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