An Italian/French/Yugoslavian/Liechtensteinian coproduction (whew!), Thou Shalt Not Kill features Laurent Terzieff as a French conscientious objector. Interwoven with his story is the saga of a German priest (Horst Frank) who faces stiff punishment for killing a Frenchman during the Second World War. Director Claude Autant-Lara characteristically uses these twin plotlines as a platform to espouse his Leftist political beliefs and to heartily condemn the Catholic church. As a result, the fact-based Thou Shalt Not Kill (originally Tu Nes Tuera Point) caused quite a stir upon its first release. Many of its sentiments became more palatable in the late 1960s, though even at that time critics carped at Autant-Lara's cut-and-dried directorial techniques.
Source : allmovie.com