C.R.A.S.H.

The Community Resources Against Street Hoodlums (C.R.A.S.H.) is a corrupt unit of the Los Santos Police Department intended to reduce the level of gang crime. Although bearing a self describing name making them out to be gang-stoppers, they are the primary antagonist group in GTA: San Andreas, with methods that make them gangsters themselves.

LOTM
They work for Officer Frank Tenpenny, to arrest and frame, then later murder any goodie two-shoes or rival villains that stand in the way of Kingpin's business interests.