Do offenders have distinct offending patterns before they join adult gang criminal groups? Analyses of crime specialization and escalation in offence seriousness

Researchers have put serious efforts into identifying youth at high risk of joining gangs. Their main focus has been on street gangs, whereas risk factors for joining adult gang criminal groups have received less attention. This study examines crime specialization and crime seriousness prior to gang initiation among 564 adult gang members, 800 outlaw bikers and matched comparison groups of offenders (up to three offenders convicted of the same number of offences) who stayed out of such gangs. The data stem from Statistics Denmark and the Police Intelligence Database. The study findings demonstrate that the gang members and the outlaw bikers commit more serious offences than their non-gang counterparts, but the study also provides evidence that it is difficult – most likely impossible – to identify upcoming members of gangs by paying attention to crime patterns only.