In the book hunger games, a few years ago 1 district (district 13) out of all 13 rebelled. As a punishment the president, president snow, killed all in district 13 and as for the rest, every year the 12 districts have to pay tributes, children from the ages 12-18 to battle it out, in an controlled environment, arena to fight to the death until only one victor remains.
After the 2 tributes are chosen, the set off to the capitol (where the wealthy live) to get dressed up, get trained and get sponors for when it's time to battle. While being there, the tributes are treated as if wealthy themselves. Then, when the fun is over, they get sent out to the areana to fight for their lives. Then, for the unlucky ones, they will more than likely die of illnesses. As for the capitol and districts, they have to watch their children kill and be killed.