The individual in international law — Aliens — Expulsion of — Right of expulsion — Convention Relating to the Status of Refugees, 1951 — Article 1 — Definition of refugee — Objection on religious grounds to performing military service in Greece — No provision in Greek law for conscientious objection — Liability to long and successive periods of imprisonment — Whether such imprisonment amounting to ‘persecution’ — Whether such imprisonment ‘for reasons of religion’ — The law of England