- Gopalan vs. State of Madras (1950): This case dealt with the interpretation of Article 21 (Right to Personal Liberty) and the extent to which preventive detention laws could restrict it. - Golaknath vs. State of Punjab (1967): This landmark judgment held that the Parliament could not amend Fundamental Rights. - Kesavananda Bharati vs. State of Kerala (1973): This judgment overruled the Golaknath case and introduced the 'basic structure doctrine', stating that while Parliament could amend Fundamental Rights, it could not alter the basic structure of the Constitution. - S.R. Bommai vs. Union of India (1994): This case dealt with the imposition of President's Rule under Article 356 and laid down guidelines for its use.