Answer:
if a state has a law that contradicts a union law then the union law is superior and should be followed in all cases. a famous case that showed this was called the factortame case where Britain tried to use its own fishing boat laws which contravened union law. the union found this action to be contrary to its laws and it was repealed.
Another View: (in the US) The above answer would be INCORRECT. Neither a labor union (nor anyone else for that matter) may have rules and regulations which contravene established US and state laws.