International audience This article deals with the lobbying practices of some agricultural interest groups and their representatives in the "sugar sector", at European level, from the early 20th century to date. The study describes three distinct periods. The first shows how an international organization of European beet growers was structured and represented its interests at international level even before the political community of Europe. This first period laid the foundation for the next period, which began at the time the EEC was created, which was characterized by strong co-management between the Community authorities and industry representatives. The third period concerns transformations of lobbying since the 1980s, when entering the era of globalization and pluralism. Despite changes in the system of interest intermediation, the representatives of the sector have continued their strategies, based on the special relationship they have with representatives of the Commission. At the same time, this period highlights the importance of the address book in political processes, and is also characterized by the European Commission's use of expertise.