The answer is knight of labors. The groups that was the most radical is knight of labors.
What is knights of labor?
The Knights of Labor, was founded in 1869, and was the first major labor organization in the United States.
The Knights of larbor involved unskilled and skilled workers.
In the era of the domestication of most labor organizations such as knights of labor, they were closely defined as "radical" labor unions.
Thus, the groups that was the most radical is knight of labors.
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