Ideally when they are deposed and captured, they will be put into solitary ADX-type cells and their environment will be monitored and governed by AI. They will be surgically fitted with a device to monitor their bodily functions and administer pain directly to their central nervous systems. They will have no human contact.
The AI will require them to do futile tasks such as turning a crank or pushing different colored lights in a sequence or whatever, and if they don't perform adequately the AI will administer pain and withhold the food and water and heat/cooling being automatically dispensed in their cells. The AI will be programmed to gradually increase the demands placed on them beyond their capacity to comply with so they will be being constantly shocked and starved, but then it will periodically ease up to allow recompliance. The AI will also tell them when to sleep while constantly breaking their sleeping pattern. The system will be set up so that they mostly die after a couple of years of constant agitation, although it will be theoretically possible for them to live a normal lifespan if they happen to be really good at the futile tasks assigned.