Newspeak...

In listening to the liberal left describe various "peoples" in a politically correct vocabulary, I get confused.
Can anyone tell me the difference between an "undocumented worker" and an "illegal alien"? Either way, they've broken the unenforced laws of the United States of America.
Can anyone tell me the difference between a "radical islamist" and a "muslim" ? In reading their koran, anyone practicing islam is a radical...all the others that claim to be muslim are frauds or liars.
Please let me know the differences as I don't see it.