Kangaroo court

A kangaroo court is a judicial tribunal or assembly that blatantly disregards recognized standards of law or justice, and often carries little or no official standing in the territory within which it resides. Merriam-Webster defines it as a "mock court in which the principles of law and justice are disregarded or perverted". The term may also apply to a court held by a legitimate judicial authority who intentionally disregards the court's legal or ethical obligations.