Read the source given below and answer the following questions:
In May 1945, Germany surrendered to the Allies. Anticipating what was coming, Hitler, his propaganda minister Goebbels and his entire family committed suicide collectively in his Berlin bunker in April. At the end of the war, an International Military Tribunal at Nuremberg was set up to prosecute Nazi War Criminals for Crimes against Peace, for War Crimes and Crimes Against Humanity. Germany's conduct during the war, especially those actions which came to be called Crimes Against Humanity, raised serious moral and ethical questions and invited worldwide condemnation. What were these acts?
Under the shadow of the Second World War, Germany had waged a Genocidal war, which resulted in the mass murder of selected groups of innocent civilians of Europe. The number of people killed included 6 million Jews, 200,000 Gypsies, 1 million Polish Civilians, 70,000 Germans who were considered mentally and physically disabled, besides innumerable political opponents. Nazis devised an unprecedented means of killing people, that is, by gassing them in various killing centres like Auschwitz. The Nuremberg Tribunal sentenced only eleven leading Nazis to death. Many others were imprisoned for life. The retribution did come, yet the punishment of the Nazis was far short of the brutality and extent of their crimes. The Allies did not want to be as harsh on defeated Germany as they had been after the First World War.
Q. Killing on a large scale of people leading to destruction is called: