'पक्षपात का सिद्धांत' (Doctrine of Bias) की अवधारणा मुख्य रूप से किस सिद्धांत से संबंधित है?

In Mohd. Yunus Khan v. State of U.P., where the initiating disciplinary authority acted as a witness and imposed dismissal, the Supreme Court held that the action violated:

In which landmark case was it held that a violation of natural justice principles by State action leads to arbitrariness and consequently violates Article 14?