Emergency provisions
Articles 352-360: National, State (President's Rule) and Financial Emergencies, their grounds, procedures, effects on rights and federalism, and post-1978 safeguards.
The constitutional architecture of Part XVIII
Part XVIII of the Constitution (Articles 352-360) equips the Union with extraordinary powers to convert the federal polity into a unitary one when the nation's existence, the constitutional machinery of a State, or financial stability is threatened. Dr B.R. Ambedkar defended these provisions in the Constituent Assembly (debate of 4 August 1949) by arguing that the Indian federation is unique because it can transform itself into a unitary state in an emergency. The framers borrowed the structure substantially from the Government of India Act, 1935 (its provincial emergency provisions) and the Weimar Constitution's Article 48.
The three types
National Emergency (Article 352) may be proclaimed on three grounds: war, external aggression, or armed rebellion. The original ground was 'internal disturbance'; the 44th Amendment Act, 1978 replaced it with the narrower 'armed rebellion' precisely to prevent a repeat of the 1975 abuse. It has been invoked thrice: during the Sino-Indian War (October 1962, lasted until 1968), the Indo-Pak War (December 1971), and the internal-disturbance emergency of 25 June 1975 to 21 March 1977.
President's Rule / State Emergency (Article 356) is imposed when the President, on the Governor's report or otherwise, is satisfied that the government of a State cannot be carried on in accordance with the Constitution. Article 365 supplements it: failure of a State to comply with Union directions is deemed a breakdown of constitutional machinery. This is the most-used provision, invoked over 125 times since 1950.
Financial Emergency (Article 360) may be proclaimed if the financial stability or credit of India or any part is threatened. It has never been invoked, even during the 1991 balance-of-payments crisis.
Procedure and duration for National Emergency
The 44th Amendment built strict safeguards. The Cabinet's written advice (not the Prime Minister alone) must be communicated to the President. Parliamentary approval is required within one month (reduced from two months) by a special majority of each House. Once approved, it continues for six months and can be extended six months at a time indefinitely. The Lok Sabha can pass a disapproval resolution by simple majority if one-tenth of members give written notice; the President must then revoke the proclamation. Judicial review of the proclamation is now available after Minerva Mills v. Union of India (1980) and S.R. Bommai v. Union of India (1994), which held that satisfaction is justiciable and not immune under the basic-structure-protected rule of law.