Here in the States there are certain neighborhoods where anyone dressed with a yarmulka ( Jewish skull cap) or wearing orthodox garb, stands a good chance of inviting verbal attacks and possibly physical violence.
The situation is even worse in Europe.
So the Amsterdam police have decided to consider the use of undercover cops dressed as orthodox Jews. This is in response to videos where orthodox Jews walking through predominantly Muslim areas are abused by the inhabitants.
This approach to peace keeping apparently is gaining a lot of support with the rise in violence toward those easily identified as Jews in parts of Europe.