Yakuza is a Japanese form of organized crime, of the typology of which the (Sicilian) Mafia is the most famous one and is supposed to be among the most 'sophisticated' and violent ones.
... of the census of 2000, there are 19,701 people, 6,700 households, and 5,011 families residing in the town. The population density is 1,549.2/km² (4,010.1/mi²). ...