Mala in se vs. mala prohibita.

I don't think it's all that debatable to say that deceiving people is categorically wrong, nor is it to say that it's immoral not to follow the laws of the land -- both are obviously untrue as absolute statements.

For extreme examples, would it be immoral to lie to the Gestapo about harboring Jews? Were people illegally helping slaves escape the American South being immoral?