I agree: the pathology of the Bannon Administration mirrors the German National Socialists. Their actions have yet rise to the level of 1930's Germany.  

The Constitution applies to every person in the US, regardless of immigration status. Indiscriminate detention and searches without warrants are illegal.  It's always been the case that the US Gov't could at any point conduct more enforcement. But it must be done within the confines of the Constitution. Since there are virtually no Constitutionally permitted reasons for the authorities to detain and search otherwise law abiding people, detection is a challenge.

The question is: will the Bannon Administration attempt to subvert or bypass the Constitution to e.g. send men dressed in assault gear to knock down doors without warrants in Latino areas?

If we see manœuvres to enable them to do this sort of thing, we'll know the US is going to a very dark place.