Agreed, I can write more clearly than the amateurs at the Detroit Historical Society. But since you have zero reading comprehension skills, please watch this video circa minute 16-17. It's clear that the union was a cartel rather than a labor union.
https://youtu.be/HSXJP_WFNp4
Also, read page 8 of this pdf, though I don't expect you to comprehend it:
ResearchGate
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