kangaroo court

n. unauthorized court, court that is not certified

A kangaroo court or kangaroo trial, sometimes likened to a drumhead court-martial or Drumhead trial, is a sham legal proceeding or court. Kangaroo courts are judicial proceedings that deny due process in the name of expediency. The outcome of such a trial is essentially made in advance, usually for the purpose of providing a conviction, either by going through the motions of manipulated procedure or by allowing no defense at all.
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Noun
1. an irregular unauthorized court
(hypernym) court, tribunal, judicature

A judicial proceeding or trial which has a predetermined outcome or where the basic legal rights of a party are jumped over. - (read more on Kangaroo Court)