It was not only about passive resistance, but also actively about defeating National Socialism. For example, the Catholic resistance group around the priest Heinrich Maier, who was often referred to as Miles Christi, very successfully passed on plans and production facilities for V-1 flying bombs, V-2 rockets, Tiger tanks, Messerschmitt Me 163 Komet and other aircraft to the Allies, with which they could target German production facilities. Much of the information was important to Operation Hydra and Operation Crossbow, both critical operations to Operation Overlord. He and his group informed the American secret service OSS very early on about the mass murder of Jews in Auschwitz. Maier advocated to the Nazi war in principle "Every bomb that falls on armaments factories shortens the war and spares the civilian population."