Whether Jews had permission to work depends quite strongly on the time period, location, and profession of choice. For example, Jews could almost always work in in-community professions, like butchers, rabbis, or ghetto-police. However, Jews were almost uniformly banned from certain professions like artisanry. Also some professions permitted to Jews in one country would be illegal for Jews in another. For example, Jews could be government officials in the US, but could not in most of Europe prior to the 20th century.