Ravagers

Ravagers is a 1979 American science fiction action film directed by Richard Compton and based on the 1966 novel Path to Savagery by Robert Edmond Alter. The screenplay concerns survivors of a nuclear holocaust, who do what they can to protect themselves against ravagers, a mutated group of vicious marauders who terrorize the few remaining civilized inhabitants.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.