They can help because although they all do things a bit different from each other it all works out. As an example Roosevelt was a republican but he was also a progressive and so he leaned to a more democratic view but when he handed his job to Taft who was full on republican, even though he changed a few things he still developed.
There was little control over urban life, they also performed social services for the immigrants, and the cities needed the services they provided. They understood how to use the political system for their own good.
The event you are referring to is called the<span>Kristallnacht, or otherwise known as the night of broken glass. What you described occurred then.</span>