People'S Union For Civil Liberties & Anr vs Union Of India

The Supreme Court upheld the constitutional validity of the Prevention of Terrorism Act, 2002 (POTA), ruling that Parliament has the legislative competence to enact laws addressing terrorism under Entry 1 of List I, distinct from mere public order issues under List II. The Court distinguished the case from Rehman Shagoo, asserting that terrorism threatens national sovereignty and integrity, thus justifying central legislation. The judgment reaffirmed the binding precedent set in Kartar Singh v. State of Punjab, 1994, regarding Parliament's authority to legislate on matters of national security.