An Affair to Dismember - S1-E8
Revealing mistake: During the big scene where the main Chucky is addressing the "Chucky army," you can tell most of the dolls aren't actually "alive." They're standing way too still and simply have a digital "blinking" animation applied over them.
An Affair to Dismember - S1-E8
Revealing mistake: When the Chucky gets shot by Kyle and falls over, you can see part of a stand attached to his back, and also very briefly see a wire that's used to pull him over.
Answer: They were blamed for the death of Jake's foster brother, which was deemed a terrible accident, and they were sent to the reform school as a punishment. Presumably, when they had to leave the reform school given what happened, they were instead given community service as punishment.
TedStixon