This is the first work in English to deal comprehensively with Italian anarchism from the beginning of the century to the rise of fascism. It reconstructs the development of anarchist and syndicalist ideas and programmes and charts their relations with Gramsci and the Turin- based Ordine Nuovo group. The book places these developments within the general context of little known links connecting Italian anarchists and syndicalists to sympathizers in Britain, France, Germany and Russia. The analysis of ‘libertarian’ politics in Italy is accompanied by a detailed and fascinating reconstruction of the social base of Italian anarchism that challenges the assumptions of much of the political sociology of the European Left. Developing a hitherto unexplored but important aspect of Gramsci's political ideas and strategies, this book contributes to our understanding of one of the central Marxist thinkers and activists of the twentieth century and to one of the critical moments in the history of the European Left. In bringing new life and understanding to an important chapter in contemporary Italian history, this book is likely to become a standard text on this pivotal thinker.