International Union of Mine, Mill, and Smelter Workers ...
INTERNATIONAL UNION OF MINE, MILL, AND SMELTER WORKERSINTERNATIONAL UNION OF MINE, MILL, AND SMELTER WORKERS. In its first incarnation as the Western Federation of Miners (WFM), established at a convention in Butte, Montana, on 15 May 1893, the International Union of Mine, Mill, and Smelter Workers (IUMMSW) organized workers who mined copper, bauxite, nickel, uranium, .