 What seems to be a reason for many being sent to prison?
He was a captain of guards in Estates-General Correctional Institution—better known to its inmates as the Jug—and if he hadn't been able to detect the scent of trouble brewing a cell-block away, he would never have survived to reach his captaincy. Every prison has its Greensleeves—sometimes they are called by different names. When you're in it, you don't much care what it is called; it is a place for punishment. She was in a detachment of three unfortunates like herself, convoyed by an irritable guard, climbing the steel steps toward Block O from the floor below, when she heard the yelling.
 people resenting the jobs they're assigned
 petty theft and small crimes  rioting over the rules imposed by the government  conspiracy theorizing  people resenting the jobs they're assigned