This work outlines a profile of Daniel De Leon, one between the most charismatic and discussed American socialist leaders, deepening his ideological contribution to Marxist and Radical thought in the United States between the end of the Nineteenth Century and the begin of the Twentieth Century. In particular, this paper analyses the development of De Leon syndicalism theory, describing how he tried to realize it through the participation to the constitutive process of the Industrial Workers of the World (I.W.W.) as well analyzing the reasons that subsequently induced him to break whit the same labor union organization.
Keywords: Daniel De Leon; Industrial Workers of the World; Socialismo Americano; Teorie del Sindacato; Sindacati industriali; Azione politica
Jel Code: B 14, B 31