The city of Milan during the second half of the nineteenth century is the field of observation for this study, which focuses on urban policing and social control in a situation that ultimately caused problems for the whole country. The case of Milan, which has not received enough attention in this regard, is particularly interesting, given its status as the northern metropolis. It was the second largest population centre in Italy and the most important economic one, a leader in the late struggle for political independence and an opponent at that time of the centralizing policies of the nation-state.1