Expropriation — Definition — Taking of property — Government interference with property — Whether capable of constituting expropriation — Whether formal act of nationalization required — Nature and extent of government interference — Appointment of temporary manager — Seizure of property by workers' organization — Whether encouraged or supported by government — Whether constituting expropriation

State responsibility — Acts of private individuals — Whether imputable to the State — Whether encouraged by government — Degree of government participation — Workers' organization — Iran-United States Claims Tribunal