Русско-англо-русский юридический словарь

Criminal law is the body of law that relates to crime. It regulates social conduct and prescribes whatever is threatening, harmful, or otherwise endangering to the property, health, safety, and moral welfare of people. It includes the punishment of people who violate these laws. Criminal law varies according to jurisdiction, and differs from civil law, where emphasis is more on dispute resolution and victim compensation than on punishment. (Wikipedia)

In order to be enforceable, a contract cannot violate "public policy". For example, if the subject matter of a contract is illegal, you cannot enforce the contract. A contract for the sale of illegal drugs, for example, violates public policy and is not enforceable. (expertlaw.com)

Illegal immigration is the migration of people across national borders in a way that violates the immigration laws of the destination country. (Wikipedia)

Constitutionality is the condition of acting in accordance with an applicable constitution; the status of a law, a procedure, or an act's accordance with the laws or guidelines set forth in the applicable constitution. When one of these (laws, procedures, or acts) directly violates the constitution, it is unconstitutional. All the rest are considered constitutional until challenged and declared otherwise, typically by courts through judicial review. (Wikipedia)