Sovereign immunity — Foreign States — Consular staff — Employees of receiving State — Jurisdiction of municipal courts to State injunction restraining foreign State from interfering with exercise of trade union rights of inch employees — Whether foreign State entitled to jurisdictional immunity — Theory of restrictive immunity — Principle of good faith, as basis of — Distinction between acts iure imperii and iure gestionis — Whether applicable where injunction applied for will interfere with State's power to organise consular offices — The law of Italy