Chris Brown's Basketball Game Drama Was Over Security Beef

Chris Brown went off at a charity hoops game because security was trying to kick his crew out ... a source close to CB tells TMZ.

We're told everything was chill at the Power 106 Celebrity Basketball Game at USC until venue security tried to remove Breezy's entourage, because they weren't wearing the appropriate wristbands.

The argument escalated between venue security and Chris' security. The folks at Power 106 -- who threw the event -- say Breezy's security told Chris they weren't getting through to the other side so he stepped in. Chris got angry when venue security blew him off and disrespected him.

Venue security continued trying to remove Chris' crew, and finally the Power 106 staff stepped in and set things straight.

Chris' crew was able to stay, and his team won the game.