The Allies got some information about Auschwitz's camps between 1941 and 1944. However, they did not believe that so many people were being killed at Auschwitz. Then two people, Rudolf Vrba and Alfred Wetzler, escaped from Auschwitz. They wrote reports about what was happening at Auschwitz. From these reports, Allied leaders learned the truth about Auschwitz in the middle of 1944.