Labor History

I have my grandfather's union card from the St. Regis Lumbermen's Union in St. Regis, MT from May 1899. I have had no success in trying to find anything about the union or anything else that relates to my grandfather's history out there. He came from Demark in the late 1800's and ended up working in a steel mill in Granite City, IL (that's where I retired from with 36 years). I would really like to know something about his past in Labor. Anyone have any suggestions? I have tried Google, etc.