International organizations — Immunity — Jurisdictional immunity — Nature and scope — Waiver of immunity — Employment dispute — World Bank — Waiver of immunity contained in World Bank’s Articles of Agreement — Whether constituting a waiver of immunity with regard to employment disputes — Principle that international organization only waiving immunity if waiver helping organization to fulfil its purpose — Whether waiver of immunity with regard to employment disputes helping World Bank to fulfil its purpose — United States International Organizations Immunities Act 1945 — The law of the United States