The Wolves (1971 film)

After going to prison for killing the boss of the Kanno gang, a gangster gets released early - only to find that his ex-gang has merged with the Kannos. But with bitter resentments lingering on both sides, bloodshed is bound to begin anew.
The Wolves (出所祝い) is a 1971 Japanese crime film directed by Hideo Gosha.