Mass arrests after Kristallnacht
Approximately 30,000 Jews in Germany and Austria were deported within the region or the country after the Kristallnacht of 9–10 November 1938. They were taken to the concentration camps Buchenwald, Dachau and Sachsenhausen by the NSDAP organizations and the police in the days after the pogrom.
Source: Wikipedia — Mass arrests after Kristallnacht (CC BY-SA 4.0)