Josef mengle was a doctor at Auschwitz. he like to perform experiments on the Jews who came in. especially twins. many died at his hands because of these tests. or were marred for the rest of their lives. he liked music to be played in concerts sometimes while he worked.
Josef Mengele did experiments on how to best kill people and he used the Jews and other prisoners at Auschwitz. He also did things like measure skulls of the Jews, timed how long it took to freeze to death. For gruesome details read The Rise and Fall of the Third Reich.
Josef Mengele performed gruesome and atrocious medical experiments (more like mad man experiments) on the Jews or with the Jews and the other undesireables. He did this at the Auschwitz-Birkenau concentration camp.
Mostly, Polish Jews. ----------------------------------------- By 1943 Auschwitz was the only extermination centre, so all Jews who were set for extermination went there, for example the Hungarian Jews.
After the experinments, they were either put into hospital care, sent to Gas Chambers or put back to Work. Most people would of been sent to death straight after if they didn't die during the experinments. ALL Jews were gassed immediantly after the experinments at Auschwitz.