Vulcan's Hammer — Philip K. Dick

The artificial intelligence called Vulcan 3 ruled the human race, more than a ma-chine, less than a god. It had lifted mankind out of the dark pre-Machine ages. It had ended war, unemployment and poverty . . . but it had not ended the most corrosive of fears, the fear of Vulcan 3 itself.

At first those who feared it were dismissed as crackpots and religious fanatics. Then the world learned what terror meant as the deadly, gleaming messengers of death appeared, soaring through the air to strike down friends and foes of Vulcan 3 alike. Who ruled them? What was the strange force that wielded-- VULCAN'S HAMMER