Der Weibsteufel(1966)

A woman (Maria Emo) cares for her older husband (Hugo Gottschlich) who makes his living smuggling things across the Tyrolian Mountains in this tragic drama. The police know the husband is up to no good but have been unable to catch him in the act. A young policeman (Sieghardt Rupp) is assigned in hopes of cracking the case, and the wife falls in love with the cop. When the husband discovers the two are in love, he picks up a knife and goes to fight the policeman for the woman he loves.