G-Unit (or Guerrilla-Unit; not Gangsta-Unit) is a successful hip-hop group currently signed under the Interscope Records label. The group first garnered a following in the underground "street" scene in New York by independently releasing several mixtapes. The group's founder, Queens-based rapper 50 Cent officially brought the group into Interscope. Since signing to Interscope, many of G-Unit's members have released several successful solo albums.
http://en.wikipedia.org/wiki/G_Unit