In the summer of 1938, Karol Wojtyla moved to Krakow in Poland where he enrolled at the Jagiellonian University. While studying such topics as philology and various languages at the university, he also did his compulsory military training. In 1939, Nazi Germany's occupation forces closed the University and from 1940 to 1944, Wojty?a worked at various jobs including as a salesman for a particular chemical company.
The German I.G. Farben Industries Group (Interessen-Gemeinschaft Farbenindustrie A.G.) had a branch and factory in Poland and the young (22 years old) Karol Wojtila worked for them in their sales department. They also ran Auschwitz Concentration Camp in Poland as well as manufacturing the gas used to kill the prisoners. As an aside, Prince Bernhard of Holland was also a Nazi sympathizer and was on the board of I. G. Farben for a short time. He was also on the board of the KLM Dutch airline that flew many of the high level Nazis to South America at the end of the war.
From the Book Review "In God's Name - An Investigation into the Murder of Pope John Paul I," by David Yallop, original release 1984, Carroll & Graf Publishers.