Question: Hanns Alexander, was a German Jewish refugee who tracked down and arrested the Kommandant of Auschwitz Rudolf Höss, was a Nazi German "SS"-"Obersturmbannführer" (lieutenant colonel) and the longest-serving commandant of Auschwitz concentration and extermination camp, in which event?
Sentence (from "Majdanek concentration camp"): Therefore, Majdanek became the first concentration camp discovered by Allied forces.
Relevant evidence: No