Just for the Hell of It (1968)

A teenage gang led by the vicious Dexter his girlfriend Mitzi and friends Denny and Lummonx create havoic in a small Florida town by harrassing various people vandalizing property well just for the hell of it When a former gang member Doug tries to prevent their ever increasing violent antics Denny takes it upon himself and a few loyal members of the gang to target Dougs girlfriend Jeanne to make him back off