Full disclosure: there is no relation between the two topics in the title above except their appearance in the same recent issue of the Archives Européennes de Sociologie/European Journal of Sociology (2014, v.55, no.2). In ‘The circulation of interpersonal credit in Renaissance Florence’ Paul McLean and Neha Gondal analyze a large network of interpersonal credit ties among Renaissance Florentine élite households to determine how Florentine personal credit was organised. After examining participation by people from different categories (neighborhoods, factions, and guilds), they conclude that use of credit provided an important mechanism for confirming élite membership and solidarity. In ‘How Do Mafias Organise? Conflict and Violence in Three Mafia Organizations’ Maurizio Catino tracks the relationship between organisational structure and type of criminal behaviour in Cosa Nostra, Camorra, and ‘Ndrangheta. Using historical, judicial and statistical evidence, he shows how differences in the degree of organisational hierarchy produce differences in both levels and targets of violence.