Which amendment is called as mini constitution ?

Mini Constitution

42nd amendment is called a mini-constitution

Why the 42nd Amendment of Indian Constitution is also known as Mini Constitution?

The Forty-second Amendment of the Constitution of India, officially known as The Constitution (Forty-second amendment) Act, 1976, was enacted during the Emergency (25 June 1975 – 21 March 1977) by the Indian National Congress government headed by Indira Gandhi.

42nd amendment was the only amendment that attempted to change the Basic structure of Constitution. It attempted to reduce the power of the Supreme Court and High Courts to pronounce upon the constitutional validity of laws. It laid down the Fundamental Duties of Indian citizens to the nation. This amendment brought about the most widespread changes to the Constitution in its history, and is sometimes called a "mini-Constitution" or the "Constitution of Indira".