On 6 November 1939 , along with his brother Stanisław and other professors of the University , Estreicher was caught in Sonderaktion Krakau . Both were transported to the Sachsenhausen concentration camp , where his brother died on 28 December 1939 . Tadeusz survived the camp and was released in February 1940 , following protests from European academics to the Nazi German government
Sonderaktion Krakau
Sonderaktion Krakau
Tadeusz Estreicher