This paper describes the results of twelve criminal investigations into criminal activities of hardcore supporters of a Dutch soccer club. The information from these criminal investigations consists of among other 74,246 transcribed, wiretapped telephone conversations and 643 pages with transcribed, secretly recorded conversations in cars (between March 2009 and June 2013). The organization and execution of these criminal activities (particularly large-scale drugs trade and extortion) is described within the context of the daily activities of these hardcore supporters. This context consists of regularly visiting soccer games (in the Netherlands and abroad), bars and the supportershome, and the subculture of hooliganism. The results show a criminal group using the opportunity structures related to hooliganism for carrying out criminal activities.

In this article notions from literature on covert and illegal networks are applied to business cartels. Comparable to most criminal networks, cartel participants need to communicate in order to coordinate their activities, whilst under the risk of getting caught. Previous studies however show cartels can remain hidden from outsiders for long periods of time. Based on an analysis of fourteen Dutch cartel cases, this article addresses the question how cartels can remain hidden from outsiders for long periods of time. The analysis shows cartel participants communicate predominantly centralized and frequent. Moreover, the results show that not concealment but social embeddedness provides a strong explanation for the longevity of secrecy regarding cartels.