This document summarizes the Supreme Court of India's judicial activism in defending the constitution and citizens' rights. Key points include:
1) The court established that it has the power of judicial review over laws and constitutional amendments through its interpretations of Articles 13, 31, and 368.
2) Through cases like Golaknath, the court developed the basic structure doctrine, limiting parliament's power to amend fundamental rights and certain core constitutional features.
3) Subsequent cases like Keshavananda Bharati further expanded and consolidated the basic structure doctrine, establishing the court as the guardian of the constitution's essential elements.
4) The court has actively interpreted and expanded the scope of fundamental rights through an