i swear i've seen this fucking thread before but couldn't find my post so...

goodfellas
godfather 1 & 2 (three was shit, why did michael have to die?)
scarface (was okay not the most gangsta)
boyz n' tha hood
american me
casino (joe pesci is gangsta anybody who says otherwise suck a dick and die)
blood in blood out
juice
belly (semi gangsta got good in the middle plot was a little boring)
a bronx tale
blow (don't know if this counts but damn penelope cruz is gangsta)