Question: George A. Schilling, was a prominent American union leader and Georgist in the late nineteenth century, he made his mark in the Chicago labor movement as a member of the cooper's union and a leader of which was the largest and one of the most important American labor organizations of the 1880s?
Sentence (from "Knights of Labor"): Knights of Labor (K of L), officially Noble and Holy Order of the Knights of Labor, was the largest and one of the most important American labor organizations of the 1880s.
Relevant evidence: Yes