You need to better describe "against their will." Surely, you're not making equivalent the plight of someone trafficked for sexual exploitation, for instance, (who believed they were legally brought into the country) with someone intentionally crossing the border for work cleaning up New Orleans.
We know that people like Racehorse would have fully prosecuted those assisting runaway slaves - the only question left is should those running the underground railroad have only "given them food and turned them in"?
What was their duty under the law? The Fugitive Slave Law of 1850
I routinely violate the traffic laws (well, not so routinely anymore), some through sheer carelessness and some through willful disregard. Because so many laws are on the books, I'm sure there are many others I violate through simple ignorance. What should I do? I should obey the laws.
I am NOT making that equivalence - I was simply answering the question by pointing out there is a wide spectrum of those classified under MAN's law as "illegal aliens" - we all know that we should obey the laws. The question is WOULD you have were you running an underground railroad station in 1860?