Whether it's considered snitching or reporting by concerned citizens depends on your political views.
Or
http://www.cic.gc.ca/english/information/protection/fraud/re...
Where you can report overstayers etc.
Being an undocumented immigrant in America is no more harmful to society than being a jew in 1930s Germany.
They are undermining legal immigrants.
My preference would be a system such as Singapore, Japan, Australia, Canada, etc. where they favor people whose skills are in short supply at home. Make it easier to hire high demand low availability skills as well as seasonal workers legally while simultaneously making it very hard to hire undocumented workers in order to encourage legal pathways.
Then, when they have children, they get benefits that citizens pay for.
Now throw in the fact that if even one illegal immigrant commits one crime, that's one more crime committed than if there was no illegal immigrant.
To compare the situation to Jews in 1930s Germany is foolish at best.
Edit - I just noticed that you use the term "undocumented immigrant." They're illegal immigrants, and ignoring that doesn't change the fact.
This stuff is the hallmark of a police state.
For those who cannot speak German, a literal translation would be "state-dissolving behavior". It sounds more dramatic in German, though. :)
I totally disagree that this is an exaggerated historic comparison. As someone who grew up in East Germany, all the measures which restrict the individual freedoms, which were put into place, over the years, make me sad and angry. And having historical examples which show the bad effects of such policies in a very striking manner is in my opinion a very useful shorthand, instead of elaborately discussing a policy (with an expected outcome). Especially the effects of Stasi methods are well researched, so they are a very useful comparison indeed.
I just wanted to pint out that what the article discusses has very close parallels to what we know about the "usefulness" of the same methods in e.g. East Germany.
[0] http://www.dailymail.co.uk/news/article-3344736/Neighbors-Sa...