Sternbach 's uncle , Leon Sternbach , the brother of Sternbach 's father Michael , was a professor of classical philology at Jagiellonian University . He was murdered in 1940 in the Nazi Sachsenhausen concentration camp as the result of the Nazi action against Polish academic teachers called Sonderaktion Krakau . His killer was Gustav Sorge
Sonderaktion Krakau
Sonderaktion Krakau
Leo Sternbach