A Kamikaze Cop (1970)
Original title: やくざ刑事
A Kamikaze Cop is a 1970 Japanese-language action movie directed by Yukio Noda, with a running time of 1h 29m. It stars Sonny Chiba, Ryōhei Uchida and Ryōji Hayama.
An undercover cop befriends a yakuza underling who through his contacts helps him infiltrate two rival Yakuza gangs. He pits the two rival gangs against each other in hopes that they will cross each other out.