The Supreme Court of India plays a crucial role in maintaining the balance of power among the three branches of government: the Executive, the Legislature, and the Judiciary. It does so through various doctrines and interventions, particularly the basic structure doctrine and the doctrine of judicial review. Here’s an examination of these roles:

Basic Structure Doctrine
The basic structure doctrine is a judicial principle that the Constitution has certain fundamental features that cannot be altered or destroyed through amendments by the Parliament. This doctrine was established to maintain the supremacy of the Constitution and prevent any form of authoritarianism.

Key Cases:
Kesavananda Bharati v. State of Kerala (1973):

This landmark case established the basic structure doctrine. The Supreme Court held that while Parliament has wide powers to amend the Constitution, it cannot alter the basic structure or essential features of the Constitution.
Essential features identified include the supremacy of the Constitution, the rule of law, the principle of separation of powers, and the fundamental rights guaranteed under Part III of the Constitution.
Indira Nehru Gandhi v. Raj Narain (1975):

The Supreme Court applied the basic structure doctrine to strike down the 39th Amendment, which sought to place the election of the Prime Minister beyond judicial scrutiny. The Court held that free and fair elections are part of the basic structure.
Minerva Mills Ltd. v. Union of India (1980):

The Supreme Court reiterated that the power of judicial review is a part of the basic structure. The 42nd Amendment, which attempted to curtail judicial review, was struck down as it violated the basic structure.
Doctrine of Judicial Review
Judicial review is the power of the judiciary to examine the constitutionality of legislative acts and executive orders. It ensures that all branches of government adhere to the Constitution.

Constitutional Basis:
Article 13: Declares that laws inconsistent with or in derogation of the fundamental rights are void.
Article 32 and Article 226: Empower the Supreme Court and High Courts, respectively, to issue writs for the enforcement of fundamental rights.
Key Interventions:
Golak Nath v. State of Punjab (1967):

The Supreme Court held that constitutional amendments affecting fundamental rights could be subject to judicial review.
Maneka Gandhi v. Union of India (1978):

The Court expanded the interpretation of the right to life and personal liberty under Article 21, stating that any law affecting these rights must be just, fair, and reasonable.
SR Bommai v. Union of India (1994):

The Court used judicial review to check the misuse of Article 356 (President’s Rule), reinforcing the principle of federalism as part of the basic structure.
Balance of Power
Between the Legislature and the Judiciary:
Judicial Review of Legislation: The Supreme Court regularly reviews legislative acts to ensure they conform to constitutional provisions. It has struck down numerous laws that violate fundamental rights or the basic structure.
Advisory Opinions: Under Article 143, the President can seek the Supreme Court’s opinion on constitutional matters, reflecting the collaborative balance between the judiciary and the legislature.
Between the Executive and the Judiciary:
Executive Actions: The Supreme Court scrutinizes executive orders and actions, ensuring they are within the bounds of law and the Constitution. Landmark cases like Vineet Narain v. Union of India (1997) established guidelines for the independence of investigative agencies.
Public Interest Litigations (PILs): The judiciary uses PILs to intervene in executive actions impacting public interest, ensuring accountability and transparency.
Conclusion
The Supreme Court of India, through the basic structure doctrine and the doctrine of judicial review, acts as the guardian of the Constitution, ensuring that no branch of government exceeds its constitutional limits. By maintaining this balance, the Court protects democratic principles, the rule of law, and fundamental rights, thus upholding the supremacy of the Constitution and ensuring the proper functioning of the Indian democratic system.