By Sjoukje van Deuren, Marianne F. H. Hirsch Ballin, Edward R. Kleemans & Arjan A. J. Blokland

The Dutch criminal law system is based on individual liability, yet part of the crime and violence Outlaw Motorcycle Gang (OMCG) members commit is collective in nature. This study examines the criminal law approach towards collective criminal behavior of OMCG members. The study analyzes police files and court judgements of criminal law cases that were filed against members of Dutch OMCGs. Additionally, interviews were carried out with public prosecutors involved in these criminal cases. The results show that it is often difficult to legally address OMCGs as criminal organizations or weigh the mere symbolic contribution of fellow club members to crime, such as the use of the OMCGs’ violent reputation. Furthermore, the results suggest that in order to circumvent legal difficulties in addressing group symbolism and OMCGs as collectives via criminal law, the Dutch Public Prosecution Office has recently opted for a stronger interplay between criminal and civil law, targeting both individual OMCG members and the structural aspects of OMCGs. Future research is needed to establish which (interplays between) legal instruments are most effective in responding to collective criminal behavior.

Trends in Organized Crime (2025) 28:79–99

By David Bright, Giovanni Sadewo, Timothy I. C. Cubitt, Christopher Dowling, Anthony Morgan

Outlaw motorcycle gangs (OMCGs) have become synonymous with organised crime through engagement in criminal activities including illicit drug production and distribution, firearms trafficking, and serious violent crime. These crimes contribute significant social and economic harms in countries that feature a presence from these groups. The current paper uses network analytics to analyse the extent of co-offending within and across established clubs in Australia, including the relative involvement of senior, or office-bearing, members. The majority of affiliates in this sample co-offended with another OMCG affiliate within the sample period, with office bearers, members, nominees and associates represented proportionally among co-offending networks to in the sample at large. However, within these clubs, criminal activities were conducted in small cliques or components of affiliates. This research supports the role of OMCGs as important facilitators of crime, and the role of co-offending in the criminal offending of affiliates. The findings hold important implications for understanding how offending is organised among OMCGs, differences between groups, differing levels of engagement from the club hierarchy

Trends in Organized Crime (2024) 27:263–285

By Matthew J. Lindquist,  Eleonora Patacchin, Michael Vlassopoulos., Yves Zenou 

We study spillover effects within co-offending networks by leveraging the deaths of co-offenders for causal identification. Our results demonstrate that the death of a co-offender significantly reduces the criminal activities of other network members. We observe a decaying pattern in the magnitude of these spillover effects: individuals directly linked to a deceased offender experience the most significant impact, followed by those two steps away, and then those three steps away. Moreover, we find that the death of a more central co-offender leads to a larger reduction in aggregate crime. We also provide evidence consistent with a new theoretical prediction suggesting that the loss of a co-offender shrinks the future information set of offenders, altering their perceptions of the probability of being convicted and consequently affecting their criminal behavior. Our findings highlight the importance of understanding spillover for policymakers seeking to develop more effective strategies for crime prevention.  

  Bonn:: Institute of Labor Economics - IZA, 2024.