Anger of the Free Folk

Anger and her people, known as the Free Folk, had traded with the domed cities for the first time only a few decades ago. The Free Folk traded the food the domed cities desperately needed to feed its starving populations, and the domed cities were forced to trade the only commodities the Free Folk wanted, the ancient books and painted masterpieces the corporation had hoarded in their warehouses for centuries. 
They hadn't always enjoyed such peaceful relations. The powerful corporation which owned and operated the cities feared the Free Folk. They'd dropped bombs from remote-controlled drones on their villages for generations. The corporation had only stopped the bombing when it became clear they needed the Free Folk for their food.
The Free Folk were immune to the flu that had wiped out most of humanity centuries ago. The corporation had built the domed cities to keep the people inside isolated from the flu. 
The Free Folk had an open, self-sustaining society. They shared knowledge with whoever wanted to learn. And now it appeared there were a few residents of one domed city who were ready to learn...