Workers' International Industrial Union

The Workers' International Industrial Union (WIIU) was a Revolutionary Industrial Union headquartered in Detroit in 1908 by radical trade unionists closely associated with the Socialist Labor Party of America, headed by Daniel DeLeon. The organization was formed when it broke with the main faction of the Industrial Workers of the World (IWW) over the question of political action.

After seven years of parallel existence as the so-called "Detroit IWW," the dissident organization changed its name to Workers' International Industrial Union in 1915. The WIIU maintained a presence in the United States, Canada, Britain and Australia before its ultimate dissolution in 1925.

The 4th Convention of the Industrial Workers of the World (IWW) was convened in Chicago on September 21, 1908, attended by 26 delegates. Despite the small size of the gathering, factional disagreement was already deep within the organization and two delegates were denied their seats at the convention – including one Daniel DeLeon of New York City. DeLeon, powerful editor of the newspaper of the Socialist Labor Party of America (SLP), The People, had already emerged as a sharp critic of IWW leader Vincent St. John and the orientation of the union, which was based upon direct action and tilted towards largely unskilled labor in the Western United States.

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