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I fear the book you quote is wrong, there is an article of the Belgian historian Maxime Steinberg ( 1936-2010), who can be considered as trustworthy, where he wrote that the Confédération syndicale belge was founded in Liège indeed, but in 1908: Les contacts entre syndicalistes révolutionnaires et indépendants aboutirent, à partir d'un bureau provisoire, au congrès constitutif de la « Confédération Syndicale Belge », le 19 avril 1908, à Liège. Une cinquantaine de délégués y représentaient une dizaine de milliers de syndiqués répartis à Anvers, Courtrai, Bruxelles, Verviers, le Centre et Liège. (Maxime Steinberg, " A l'origine du communisme belge: L'extrême-gauche révolutionnaire d'avant 1914", initially published in Cahiers marxistes (Brussels) n°8, Dec.-Feb. 1971) -- 109.129.220.196 ( talk) 18:34, 20 August 2011 (UTC) reply