What is the name this BET Movie?!?!?!?

its several black men who dont like each other who are locked up and are blamed for the murder of a black guard but none of them had did it so the Ward put all of the in solitary and at the end they came together and killed the Ward in a conferance room. there was also an undercover girl who was sneaking in and having with the inmate to get information...at the end of the movie she was a news reporter outside the jail.