Asimov's Laws in 1942

1. A robot may not injure a human being, or, through inaction,
   allow a human being to come to harm.
2. A robot must obey the orders given it by human beings except
   where such orders would conflict with the First Law.
3. A robot must protect its own existence as long as such
   protection does not conflict with the First or Second Law.

Amended these laws to deal with conflicts between people

But laws are inevitably ambiguous and require judges

Don't want a super-intelligent lawyer looking for loopholes