Who is Prohaska from the nonfiction book, Into That Darkness: An Examination of Conscience?

Prohaska is a German SS officer at the time Nazi Germany invades Austria. He is introduced fairly early in the book. He is placed above the Austrian policeman Franz Stangl shortly after the invasion when personnel from the Linz police force are transferred. Franz notices him specifically because he senses that the other man dislikes him. The dislike is so strong that Franz Stangl reports that Prohaska hates him.