Jewish Police(Judischer Ordnungsdienst), the Jewish police units organized in the ghettos by the Judenrat. The Jewish police collected people for forced labor, guarded the ghetto fences and gates and eventually seized people for deportations.
There was often misconduct and corruption among the police, and they were regarded with apprehension by the ghetto community. They and their families were, at first, exempt from deportation, but this exemption was rescinded when their usefulness to the Germans ceased.
Source: Encyclopedia of the Holocaust.