This thesis is a study of the colony of Italian anarchists who found refuge in London in the years between the Paris Commune and the outbreak of the First World War. The first chapter is an introduction to the sources and to the main problems analysed. The second chapter reconstructs the settlement of the Italian anarchists in London and their relationship with the colony of Italian emigrants. Chapter three deals with the activities that the Italian anarchists organised in London, such as demonstrations, conferences, and meetings. It likewise examines the ideological differences that characterised the two main groups in which the anarchists were divided: organisationalists and anti-organisationalists. Italian authorities were extremely concerned about the danger represented by the anarchists. The fourth chapter of the thesis provides a detailed investigation of the surveillance of the anarchists that the Italian embassy and the Italian Minster of Interior organised in London by using spies and informers. At the same time, it describes the contradictory attitude held by British police forces toward political refugees. The following two chapters are dedicated to the analysis of the main instruments of propaganda used by the Italian anarchists: chapter five reviews the newspapers they published in those years, and chapter six reconstructs social and political activities that were organised in their clubs. Chapter seven examines the impact that the outbreak of First World Word had on the anarchist movement, particularly in dividing it between interventionists and anti-interventionists; a split that destroyed the network of international solidarity that had been hitherto the core of the experience of political exile. Chapter eight summarises the main arguments of the dissertation.