When they put on a show-trial in a kangaroo court, they deny due process. When the Judge is dealing with a Statute (always) he is a (bought and paid for) Clerk masquerading as a Judge and he cannot do anything judicial like issue warrants, or orders. They are operating in their private capacity, and they have no immunity. They routinely deny due process, and in fact it is rare when you are given due process, which is why it is a show-trial and kangaroo court.
The end result is that if they are not operating in their official anything they do is a fraud and a nullity. It i s a void judgment. A void Judgment can be attacked at any time or any place collaterally or otherwise.