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 "George A. Schilling"): He made his mark in the Chicago labor movement as a member of the cooper's union and a leader of the Knights of Labor.
Relevant evidence: Yes