Sure they can, at least in theory. US citizens have to pay taxes no matter where they reside. Most countries will prosecute certain crimes abroad if those crime

Sure they can, at least in theory. US citizens have to pay taxes no matter where they reside. Most countries will prosecute certain crimes abroad if those crimes were committed by their citizens or against their citizens or against the state. The practical question is just if they can get hold of the people acting unlawfully.