First, it is not against the law to give sanctuary to an undocumented immigrant. I know that one of the bills that our Bishops opposed recently before Congress was
trying to make it a crime to do so and failed.
Second, the Church does not forbid breaking man-made laws that violate the laws of God.
I don’t see how it can be justified under God’s laws to make it a crime to give solace or sanctuary, to feed the hungry, clothe the naked, etc (see Christ’s admonition in Matthew 25:31-46). Such a law would be in violation of God’s word and bring forth God’s vengeance (see sins that cry out to God for vengeance). (
forums.catholic-questions.org/showthread.php?t=167692&page=4) my previous post #60. To say nothing of how Nazi-like such a law would be.
Again, if you truly care to understand where I am coming from on this issue you have only to read the Church’s Pastoral Statements and Encyclicals (The Compendium of Social Doctrine

is online now too!) on the subject as that is where I am forming my conscience on this issue.
Aside from that this discussion has 1) gotten WAY OFF TRACK and 2) is just going in circles.
Adios Amigos! Via con Dios!