I understand that the word "law" is a heavy word and its meaning varies depending on someone's worldview or set of presuppositions one perceives the world. I am speaking of law from the Judeo-Christian point of view.
As to the second part of your question, I agree with you that there is a difference between law and justice. Unfortunately, most laws are unjust and that's why human laws are made to make plunder legal thereby instead of serving justice, they become tools to make injustice institutionalized.