Violent conduct by youths ranks among the types of inappropriate behavior generally originating in difficult family and social contexts. A proper understanding of the development of violent conduct must consider the situation taken as a whole. This article documents the results of a qualitative study which aimed to determine the psychosocial profiles and needs of youths with serious behavior problems and a family history of physical, psychological or sexual abuse. The results are based on the review of clinical files of 12 boys and 11 girls between the ages of 9 and 17, who were under child protection. The 23 files were analyzed to document the simultaneous evolution of behavior problems, abuse, family and school context, and the intervention of child protection services (reporting, evaluation, measures taken, foster care). The qualitative analysis followed the chronology and life history of each youth, resulting in the emergence of three generic profiles: the Undesirable, the Explosive, and the Delinquent. Each of the profiles is described and placed in perspective using the attachment, trauma and socialization theories respectively. The study concludes with proposals of distinct intervention models to be applied to these youths in the school environment. (Contains 6 tables and 6 notes.)