Police think last week's violent robbery of Chris Brown's LA-area mansion was an inside job.

They've fingered club promoters who knew of Brown's whereabouts as the culprits. But Brown thinks the four thieves who got away with 50K in cash were even more than just casual friends. Breezy believes he was ripped off by members of his inner circle.

There are also reports that the crime was committed by Bloods, and the LAPD's gang unit is currently investigating the crime.

Although it's doubtful he was ever initiated into the street gang, Brown has repped the Bloods throughout his career, and has hired them to work security, etc.

According to TMZ, Brown had been told to distance himself from certain friends before the incident. Maybe the robbery will result in him heeding that advice.