Syndicalism is a revolutionary current within the labor movement that seeks to unionize workers according to industry and advance their demands through strikes with the eventual goal of gaining control over the means of production and the economy at large. Developed in French labor unions during the late 19th century, syndicalist movements were most predominant amongst the socialist movement during the interwar period which preceded the outbreak of World War II. Major syndicalist organizations included the General Confederation of Labor in France, the National Confederation of Labour (CNT) in Spain, the Italian Syndicalist Union (USI), the Free Workers' Union of Germany, and the Argentine Regional Workers' Federation. Although they did not regard themselves as syndicalists, the Industrial Workers of the World, the Irish Transport and General Workers' Union and the Canadian One Big Union are considered by most historians to belong to this current. A number of syndicalist organizations were and still are to this day linked in the International Workers' Association, but some of its member organizations left for the International Confederation of Labor, formed in 2018. Terminology The term syndicalism has French origins. In French, a is a trade union, usually a local union. The corresponding words in Spanish and Portuguese, , and Italian, , are similar. By extension, the French refers to trade unionism in general. The concept or revolutionary syndicalism emerged in French socialist journals in 1903 and the French General Confederation of Labor (, CGT) came to use the term to describe its brand of unionism. Revolutionary syndicalism, or more commonly syndicalism with the revolutionary implied, was then adapted to a number of languages by unionists following the French model. Many scholars, including Ralph Darlington, Marcel van der Linden, and Wayne Thorpe, apply the term syndicalism to a number of organizations or currents within the labor movement that did not identify as syndicalist. They apply the label to one big unionists or industrial unionists in North America and Australia, Larkinists in Ireland, and groups that identify as revolutionary industrialists, revolutionary unionists, anarcho-syndicalists, or councilists. This includes the Industrial Workers of the World (IWW) in the United States, for example, which claimed its industrial unionism was "a higher type of revolutionary labor organization than that proposed by the syndicalists". Van der Linden and Thorpe use syndicalism to refer to "all revolutionary, direct-actionist organizations". Darlington proposes that syndicalism be defined as "revolutionary trade unionism". He and van