The Peace Killers (1971)

 The Peace Killers (1971) 

aka

Die auf heißen Öfen verrecken

Siblings Kristy and Jeffrey are buying supplies at a remote desert 

gas station when some members of a biker gang come cruising in. 

The bikers recognize Kristy, who used to be the main squeeze of 

the gang's leader before she ran away. The pair get away, but 

the bikers find out that they're living in a nearby commune, and 

start making their battle plans to bring Kristy back. (IMDB Jean-Marc Rocher)

'The Peace Killers' poster in a scene from 'Cecil B. DeMented'