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How did Giuseppe Fanelli help spread anarchism in Spain?

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Giuseppe Fanelli, an Italian disciple of Mikhail Bakunin, played a pivotal role in establishing the anarchist movement in Spain. In 1868, he visited Barcelona and Madrid, where he successfully founded branches of the First International.1

By organizing these groups, Fanelli helped lay the foundation for a movement that grew rapidly, reaching 40,000 members by 1870 and 60,000 by 1873. His efforts were instrumental in ensuring that Bakunin’s version of anarchism became the dominant influence in the Spanish labor movement, eventually leading to the formation of powerful organizations like the National Confederation of Labour (CNT).12