The Role of Doctors in the Nazi Party

There are more doctors in the Nazi Party than any other profession from memory. Doctors who as you say are trained to save lives are selecting who dies and doesn't die. And also at Auschwitz they are conducting the most horrendous medical experiments, but they believe that what they're doing is well you may die, but the benefits of that will go to other people. I wanted to go back a little bit to June 1941 when the Germans invade Soviet Union. What was the relevance of this year to the Holocaust or what was happening at this time?