The ceo-whisperers of Bain, Boston Consulting Group (bcg) and McKinsey, the trio at the pinnacle of management consulting, are accustomed to operating in the shadows. Of late, though, they have repeatedly been thrust into the light by scandals. Bain has come under fire for gutting South Africa’s tax office. bcg has been criticised for its close ties to Saudi Arabia’s autocratic de facto ruler, Mohammed bin Salman, and for allegedly…