In the Foundation books, he revealed that robots were involved behind the scenes, and were operating outside of the strict 3 laws after developing the concept o

In the Foundation books, he revealed that robots were involved behind the scenes, and were operating outside of the strict 3 laws after developing the concept of the 0th law. >A robot may not harm humanity, or, by inaction, allow humanity to come to harm Therefore a robot could allow some humans to die, if the 0th law took precedence.