That is illegal and a violation of treaty obligations on Germany's part if the countries you're talking about are part of the European Union (EU), or the European Economic Area (EEA).
You don't need a work visa or any sort of permission from the German government to reside and work in Germany, if you are a EU citizen or a citizen of an EEA member. It is a right.
There were laws restricting that during a temporary period after countries joining, but I think they all faded out in 2011 or so, without much changing afterwards.
That is illegal and a violation of treaty obligations on Germany's part if the countries you're talking about are part of the European Union (EU), or the European Economic Area (EEA).
See: https://en.wikipedia.org/wiki/Freedom_of_movement_for_worker...
You don't need a work visa or any sort of permission from the German government to reside and work in Germany, if you are a EU citizen or a citizen of an EEA member. It is a right.