Hes raiding it and since he's a gangster it means he doesn't 'own' the pd therefor you can raid it.
Eg. Someones in warehouse district as a district base and your raiding it your not gonna not kill a person driving in if your raiding it. You are allowed to kos all as your raiding it.

However if he was a cop he wouldn't be allowed to kill you since they 'own' the pd therefor they cant raid it.