In which case did the Supreme Court hold that Parliament may amend any part of the Constitution but may not alter its basic structure?

Explanation

1. 01

   A thirteen-judge bench decided Kesavananda Bharati in 1973 and laid down the basic structure doctrine.

2. 02

   Golaknath (1967) had gone further and held that Parliament could not amend Fundamental Rights at all; Kesavananda overruled it.

3. 03

   Maneka Gandhi widened Article 21, and Bommai dealt with President's rule in the States.