Ummm, if you do as much as show a swastika, or do a Nazi salute, or publicly deny the Holocaust, you WILL be arrested in Germany.
It is MUCH more difficult to hold racist or Nazi views--even in private--in Germany than the USA.
What particular "NAZI law within its borders" in Germany are you talking about?
But there are still laws that were enacted during the NAZI era that are still on the books.