and most other IWW historians, the IWW's industrial unionism was the specifically American form of syndicalism. Nevertheless, the IWW also had a presence in Canada and Mexico nearly from its inception, as the US economy and labor force was intertwined with those countries. French syndicalism and American industrial unionism influenced the rise of syndicalism elsewhere. Syndicalist movements and organizations in a number of countries were established by activists who had spent time in France. Ervin Szabó visited Paris in 1904 and then established a Syndicalist Propaganda Group in his native Hungary in 1910. Several of the founders of the Spanish CNT had visited France. Alceste de Ambris and Armando Borghi, both leaders in Italy's USI, were in Paris for a few months from 1910 to 1911. French influence also spread through publications. Emile Pouget's pamphlets could be read in Italian, Spanish, Portuguese, English, German, and Swedish translations. Journals and newspapers in a number of countries advocated syndicalism. For example, , a journal mainly for miners in Charleroi, Belgium, urged its readers to follow "the example of our confederated friends of France". The IWW's newspapers published articles on French syndicalism, particularly the tactic of sabotage and the CGT's carried articles about Britain's labor movement by the British syndicalist Tom Mann. Migration played a key role in spreading syndicalist ideas. The Argentine Regional Workers' Federation (, FORA), openly anarchist by 1905, was formed by Italian and Spanish immigrants in 1901. Many IWW leaders were European immigrants, including Edmondo Rossoni who moved between the United States and Italy and was active in both the IWW and USI. International work processes also contributed to the diffusion of syndicalism. For example, sailors helped establish IWW presences in port cities around the world. Syndicalists formed different kinds of organizations. Some, like the French radicals, worked within existing unions to infuse them with their revolutionary spirit. Some found existing unions entirely unsuitable and built federations of their own, a strategy known as dual unionism. American syndicalists formed the IWW, though William Z. Foster later abandoned the IWW after a trip to France and set up the Syndicalist League of North America (SLNA), which sought to radicalize the established American Federation of Labor (AFL). In Ireland, the ITGWU broke away from a more moderate, and British-based, union. In Italy and Spain, syndicalists initially worked within the established union confederations before breaking away and forming USI and the CNT