Security for the club then descended on 2 members of the posse, beating them to a bloody pulp ... at one point kicking one of them in the face while he was down.
LAPD cops were present during part of the fight ... as were off-duty officers who were working at the club.
You gotta watch the standoff ... it is intense and on the edge of erupting into violence.
The 2 injured men were taken to LAPD's Hollywood division but no one wanted to file charges so they left.
You hear people screaming "Bloods" and "Crips" in the video ... but we don't know if this was gang related. But it was definitely bad.