Quel giorno Dio non c'era (Il caso Defregger)

Also known as Der Tag, an dem Gott nicht da war, Horreur Nazi, Le SS était là, O Theos den itan ekei

Based on a real WW2 episode. In 1944 in a small village in the Italian Appenines several inhabitants are executed in reprisal for a partisan attack on the German occupying troops. The lieutenant responsible for the execution becomes a priest and then a bishop and several years later he is put on trial for the killings.