is there any good anime about organized crime, mobsters, etc.?
Go Read Sanctuary
Gokusen, FMP:Fumoffu, Stop! Hibari-kun, Kateikyou Hitman Reborn, Seto no Hanayome
Organized crime you said ???
Everything in >>11526841 involves yakuza or mafia, and most - on an extremely high level.
Baccano. Go watch it RITE NAO
Fumoffu is a fucking comedy with only one mafia oriented episode.
everything else is either kids show shit or comedy.
One of the most organized crime ever.
He didn't specify whether it should be a serious anime or not.