Industrial Workers of the World
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![Big Bill Haywood and office workers in the IWW General Office, Chicago, summer 1917.](/Images/godic/202501/21/IWW-headquarters-19170342.jpg")
![The first IWW charter in Canada, Vancouver Industrial Mixed Union no.322, May 5, 1906.](/Images/godic/202501/21/IWW_charter0342.jpg")
![The black cat symbol, created by IWW member Ralph Chaplin, is often used to signify sabotage or wildcat strikes.](/Images/godic/202501/21/Anarchist_black_cat.svg0342.png")
The Industrial Workers of the World (IWW), members of which are commonly termed "Wobblies", is an international labor union that was founded in 1905. The union combines general unionism with industrial unionism, being a general union itself whose members are further organized within the industry of their employment. The philosophy and tactics of the IWW are described as "revolutionary industrial unionism", with ties to both socialist and anarchist labor movements. The origin of the nickname "Wobblies" is uncertain.