We analyze delinquent networks of adolescents in the United States. We
develop a dynamic network formation model showing who the key player is,
i.e. the criminal who once removed generates the highest possible reduction
in aggregate crime level. We then structurally estimate our model using data
on criminal behaviors of adolescents in the United States (AddHealth data).
Compared to other criminals, key players are more likely to be a male, have
less educated parents, are less attached to religion and feel socially more
excluded. We also find that, even though some criminals are not very active in
criminal activities, they can be key players because they have a crucial
position in the network in terms of betweenness centrality.

Keywords: Bonacich centrality, crime policies and dynamic network formation