Boryokudan

(Japanese: �tough gang�), any of various Japanese criminal gangs of centuries-long tradition, which combined in the 20th century into Mafia-like organizations. Members, often called yakuza (�good-for-nothing�), or gyangu (�gangster�), adopt samurai-like rituals and often bear elaborate body tattoos. They engage in extortion, blackmail, smuggling, prostitution, drugs, gambling,