They are not the main opposition. They are the supposed opposition they all created to divert public attention.
in reference to:"The country's opposition is led by former premier Mir-Hossein Moussavi, former parliament speaker Mehdi Karroubi and ex-presidents Mohammad Khatami and Akbar Hashemi-Rafsanjani."
- Iran's supreme leader says efforts by opposition futile - Monsters and Critics (view on Google Sidewiki)