The Judenrat constituted a form of self-enforcing intermediary, used by the Nazi administration to control larger Jewish communities in occupied areas. The Germans also implemented the name Jewish Council of Elders (Jüdischen Ältestenrat or Ältestenrat der Juden) in some ghettos, as in the Łódź Ghetto, and in Theresienstadt or in the Bergen-Belsen concentration camp.[2][3] While the history of the term Judenrat itself is unclear, Jewish communities themselves had established councils for self-government as far back as the Medieval Era. While the Hebrew term of Kahal or Kehillah was used by the Jewish community, German authorities generally tended to use the term Judenräte. hope this helps :)