6- How were the Jews forced to publicly identify who they were?

The Jews of Europe were legally compelled to wear badges or distinguishing garments (e.g., pointed hats) at least as far back as the 13th century. This practice continued throughout the Middle Ages and Renaissance, but was largely phased out during the 17th and 18th centuries. With the coming of the French Revolution and the emancipation of western European Jews throughout the 19th century, the wearing of Jewish badges was abolished in Western Europe.