The Boss (1965)

When Nick Davis leaves prison after one year in solitairy, he is hired to operate a forklift in a warehouse in the harbor owned by the Japanese Yakuza patriarch Isshin Tendo. The place is assaulted by the Italian Mafia lead by Dino Campanela and Nick rescues and saves the life of Shuji Sawamoto, who is the representative of Yakuza interests in America. Shuji hires Nick to work for Yakuza and becomes his godfather in the family after his oath to join Yakuza. However, Nick is a lonely FBI undercover agent assigned to penetrate the criminal organization. When the FBI discovers that Campanela is organizing a massive attack to destroy the Yakuza, Nick's boss Littman calls off the operation to leave the dirty work to the Italian Mafia. But the connection of Nick with Shuji and his goddaughter Yuko forces him to help his Japanese family.

Ryūichi and his small gang of Triad vie for control of the Japanese underworld in a crime-ridden Shinjuku quarter while Detective Jojima tries to bring it down.

When a mysterious stranger muscles into two rival yakuza gangs, Tokyo's underworld explodes with violence.

Reiji Kikukawa, who has a strong sense of justice, graduated from the police academy with the lowest score ever. He becomes a police constable, but is suddenly fired by the Police Chief due to "disciplinary" issues. In actuality, the firing is part of a carefully orchestrated plan to set him up as an undercover cop in the Yakuza.

Eddie Kenner is given a special assignment by the Army to get the inside story on Sandy Dawson, a former GI who has formed a gang of fellow servicemen and Japanese locals.

A self-destructive man becomes a powerful member of the yakuza but quickly loses his self-control. Based on the true story of Rikio Ishikawa.

When young protege Akira Kageyama is bitten by his dying vampire boss, Genyo Kamiura, he must get used to his new powers before seeking revenge.

A hustler who gets in trouble with a gang boss in the port town of Sukago agrees to make good with the don by putting him in contact with a mysterious hitman — an assassin the hustler has no idea how to contact. Instead, he hires an actor to play the role, though the thespian has no idea what he's getting into.

A former American G.I. joins a yakuza family after his release from prison in post-World War II Osaka.

Kensuke Sonomura directs the legendary Hitoshi Ozawa in this ultimate V-Cinema actioner. Kaiko City is plagued with poverty and crime. When a corrupt businessman decides to run for mayor and starts eliminating opponents from the rival mafia, a former police captain serving time for murder is secretly released and put in charge of a special task force to arrest him.