Anglo-Iranian Oil Company v. Idemitsu Kosan Kabushiki Kaisha.

International Law — Relation to Municipal Law — Recognition of Acts of Foreign Governments Contrary to International Law — Expropriation without Compensation — Nationalization.Recognition of Acts of Foreign States and Governments — Acts Contrary to International Law — Expropriation and Confiscation.Aliens — Treatment of — Property of Aliens — Expropriation without Compensation — Expropriation by Iran of Property of Anglo-Iranian Oil Co. — Confiscatory Nature of the Expropriation — Question of Validity of Decree Purporting to Deprive an Alien of his Property — Purported Transfer of Title by Expropriating State — Nature of Concession Agreement — Whether a Treaty — Recognition of Acts of Foreign Governments Contrary to International Law — National Constitution — Right to Adjudicate on Validity of Foreign Nationalization Law — Presumption in favour of Conformity with International Law — Nationalization of Expropriated Oil Already Extracted when Nationalization Law Came into Force — Ownership of Expropriated Oil — International Law — Relation to Municipal Law — The Law of Japan.