The document discusses the basic structure doctrine of the Indian Constitution. It outlines key cases like Kesavananda Bharati v. State of Kerala that established that Parliament does not have unlimited power to amend the Constitution and cannot damage its basic structure. The basic features identified by judges include the supremacy of the Constitution, republican and democratic form of government, secularism, separation of powers, federalism, and unity and integrity of the nation. Later cases like Indira Nehru Gandhi v. Raj Narain added free and fair elections as a basic feature, while Minerva Mills v. Union of India established that harmonizing fundamental rights and directive principles is also a basic structure. In conclusion, the basic structure doctrine has