Crime Mob is a hip hop/crunk group consisting of five members, M.I.G., Diamond, Cyco Black, and siblings Lil' Jay and Princess. Former member Killa C was featured on their first self-titled album, but soon left the group after charges of drug possession and failing to register as a sex offender. They are best known for their 2004 chart topping single "Knuck If You Buck," which was produced by Lil' Jay. Crime Mob took their name from a gang located in the Ellenwood area, southeast of downtown Atlanta, Georgia.