The Mad Executioners
Der Henker von London (original)
Le bourreau de Londres pend des criminels condamnés par un tribunal secret qui s'en sont tirés indemnes devant la justice de l'État.
Starring Hansjörg Felmy, Maria Perschy, Dieter Borsche, Wolfgang Preiss, Harry Riebauer, Rudolf Forster, Chris Howland, Rudolf Fernau, Bruno W. Pantel, Albert Bessler
It's a crime and horror movie, and has a rating of 6.1 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from France.