The American Labor Union (ALU) was a radical labor organization launched as the Western Labor Union (WLU) in 1898. The organization was established by the Western Federation of Miners (WFM) in an effort to build a federation of trade unions in the aftermath of the failed Leadville Miners' Strike of 1896. The group changed its name from WLU to the more familiar ALU moniker in 1902 at its fifth annual convention. The group had a peak membership of about 43,000 — of which 27,000 were members of the WFM. The ALU was a precursor to the Industrial Workers of the World (IWW), established in 1905, which effectively terminated it. Organizational history Forerunner The Western Labor Union (WLU) was a labor federation created by the Western Federation of Miners (WFM) after the disastrous Leadville strike of 1896-97. The WLU was conceived in November, 1897 in a proclamation of the State Trades and Labor Council of Montana, and gained support from the WFM's executive board in December 1897. Establishment The WLU was formed in 1898 at a convention in Salt Lake City which was attended mostly by former members of the Knights of Labor. The new federation was formed as a response to the conservatism of the American Federation of Labor. The hardrock miners of the WFM had become well-organized, but apart from the miners, mining territories were largely unorganized. Members of the WFM saw the WLU as an opportunity to meet the needs of these other workers, and also as a means to bolster solidarity when the need arose. Eugene V. Debs assisted with the formation of the WLU. The federation initially comprised 14,000 miners and 400 individuals from other trades. Among the other trades were Colorado coal miners' locals, Colorado railway workers, western hotel and restaurant workers, carpenters, typographers, grocery clerks, laundry workers, cooks and waiters, hack drivers, and mattress makers. After the transfer of the Western Federation of Miners headquarters [ to Denver, Colorado ] in 1900, and especially after the opening of a WLU office there in May 1901, the WLU began a period of astonishing growth. Of the seventy-one new charters the WLU issued to unions between May 1901 and February 1902, seventeen were to organizations in Denver. The WLU's initial base in Denver lay with the eleven hundred workers at the Globe and Grant smelters ... [ but the WLU ] represented a diverse array of