Hobos.
No need for cops since we have FBI / S.W.A.T. Pretty much the same thing.
EDIT:
I've also decided on the original spawnwep these characters can contain if one is chosen.
Police: Nightstick (melee used in VC) , Shotgun (Acquired 5 ammo when enter police cruiser + used secretly by officers with a 3 star wanted) , MP5 (Seems Legit in Close Third Person Combat)
Hobos: Baseball Bat (ordinary melee weapon for homeless) , Spaz (Can be given to them.. No reason specified) ,
Ruger ( Best assualt rifle for the homeless, rare, but makes them dangerous in certain battle conditions)
Businessmen: Python, Stubby, m60 (These weapons are highly valuable, thus acquianted for the rich)
Thugs: (If additional) Molotov, Shotgun, Tec9 (Makes a great pair, Honestly, I came up with thise pair from a CLEO mod I played in Single Player Vice, when I lost my connection

)