Oh dear.
We, the wise people of the world, have moved on from all that.
The state's walking living human beings into death chambers and wheeling them out dead is bad enough [should be abolished].
The old ways were barbaric and are not necessary today anyway.
Want to keep the bad people out?
Simple...don't let them in.
Seal the borders, ...walls, fences, moats, razor wire, solar lights, cameras, armed agents, soldiers...etc.
US needs migration...legal migration. Authorised immigrants, judged as being needed by the country...good people.
Deport all people found to be in the country illegally.
Trouble is..."This country has a thirst for cheap labor"- US sheriff at the Mexican border detailing to a reporter all about the problems.
The solution; Indroduce a visa work program for approved 'migrants'.
Come in, seasonal or not...work, then exit, and reapply for another visa to return.
Introduce laws that require employers to obtain from employees proof or their right to work in America.
Prosecute any employers hiring illegal immigrants/visa over-stayers etc who can't prove they have the right to work in America.
Your support of the invasion is noted. The rest is dismissed.