In Maneka Gandhi v. Union of India (1978), the Supreme Court held that the procedure established by law under Article 21 must be fair, just, and reasonable, importing the concept of ______ due process from American constitutional law.

Procedural due process evolution: (a) A.K. Gopalan (1950): Article 21 required only 'procedure established by law'; no substantive due process review, (b) Maneka Gandhi (1978): Overruled Gopalan; held procedure under Article 21 must be 'fair, just, and reasonable', not arbitrary or oppressive; imported procedural due process, (c) Impact: Enabled judicial review of executive action affecting life/liberty; foundation for expanding Article 21 to include privacy, health, environment, livelihood, (d) Balance: Courts don't substitute wisdom for administrators; check for procedural fairness, rationality, non-arbitrariness. Illustrates judicial creativity: adapting foreign concepts (due process) to Indian constitutional text while respecting separation of powers.