The most spectacular individual group of the Austrian resistance was the one around the priest Heinrich Maier. On the one hand, this very successful Catholic resistance group wanted to revive a Habsburg monarchy after the war and very successfully passed on plans and production facilities for V-1, V-2 rockets, Tiger tanks and aircraft (Messerschmitt Bf 109, Messerschmitt Me 163 Komet, etc.) to the Allies. The resistance group, later uncovered by the Gestapo, was in contact with Allen Dulles, the head of the US OSS in Switzerland. With the location sketches of the production facilities, the Allied bombers were able to carry out precise air strikes and thus protect residential areas. The information was important to Operation Crossbow and Operation Hydra, both preliminary missions for Operation Overlord. In contrast to many other German resistance groups, the Maier group informed very early about the mass murder of Jews through its contacts with the Semperit factory near Auschwitz.