I am not a lawyer and I am NOT giving out legal advice but:

The last time I checked illegal immigration was still a violation of federal law--as well as crimes that might be committed by Americans--harboring, concealing, assisting. Don't victims have some rights under tort law? Illegal aliens are also considered a danger by such notable legal authorities as THE US STATE DEPARTMENT!! Can one sue for emotional distress in federal court?

And who said that concealing an alien has to mean hiding him/her away in some underground bunker? When they are in any building aren't they concealed from public view? And aren't all illegal aliens placed in the same category--whether you're concealing Osama bin Laden or Sister Maria Carlos Juanita Nguyen Chang from the Tegucigalpa Orphans's Home?