This text is a detailed explanation of **MISA (Maintenance of Internal Security Act)**, its connection to **Habeas Corpus**, and its implications for **Article 21 of the Indian Constitution**. The speaker outlines how MISA, a law allowing for preventive detention, was used during India's Emergency period and challenged in court, notably through Habeas Corpus petitions. The discussion contrasts the concepts of **"procedure established by law"** and **"due process of law"** in relation to Article 21 (right to life and personal liberty), using significant court cases like **AK Gopalan v. State of Madras** and the **ADM Jabalpur case (Habeas Corpus case)** to illustrate the evolving judicial interpretation of these principles. Ultimately, the text emphasizes how the judiciary's role in protecting fundamental rights against potentially arbitrary state action has developed over time, culminating in the overturning of the controversial ADM Jabalpur judgment.

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