The concept of "Basic Structure" of the Indian Constitution was introduced in the landmark case Kesavananda Bharati v. State of Kerala (1973). The Supreme Court held that Parliament cannot alter or amend the basic structure or framework of the Constitution. This doctrine was a significant development in Indian Constitutional law, ensuring that certain fundamental principles of the Constitution remain inviolate.
The other cases mentioned:
- A. K. Gopalan v. State of Madras (1950) dealt with the interpretation of fundamental rights under Article 21 and did not introduce the basic structure doctrine.
- Maneka Gandhi v. Union of India (1978) expanded the interpretation of Article 21 but did not establish the basic structure.
- Minerva Mills v. Union of India (1980) reinforced the basic structure doctrine but did not introduce it.
Thus, the correct answer is Kesavananda Bharati v. State of Kerala (1973).