An anonymous reader writes "After every major war, technology developed for a conflict gets applied to civilian life. The BBC recently reported that Army researchers have adapted advanced social network analysis software used for counter-insurgencies in Iraq and Afghanistan to help law enforcement analyze the behavior of street gangs. With the growing problem of gang violence in major U.S. cities, this may provide a fresh perspective. 'Orca can figure out the likely affiliations of individuals who will not admit to being members of any specific gang, as well as the sub-structure of gangs – the gang ecosystem – and the identities of those who tend to dictate the behaviour of others. ... Having some knowledge of the links and affiliations between different gangs can highlight dangers that call for more focused policing. If a gang perpetrates some violent action on a rival gang, police will often monitor the rival gang more closely because of the likelihood of retaliation. But gangs know this, and so the rivals might instead ask an allied gang to carry out a reprisal. Understanding such alliances helps the police stay a step ahead.' The question is: will it work?"