At the beginning of 1870 he was in Paris as guest of the painter Giuseppe De Nittis, a fellow townsman who described him as a "beautiful young man, fascinating to women".
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In 1875 Cafiero went to Milan and joined the editorial staff of the first socialist daily paper, La Plebe, edited by Enrico Bignami.
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In December 1880 he participated in the Faiail Congress in Chiasso, where he supported Carlo Cafiero's anti-legal position.