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On the whole, it probably does make sense to avoid investing in companies run by rogues but if one is to break that rule, it pays to back a rogue who knows how to generate cash. Perhaps rogue is too strong a term for Kostyantyn Zhevago, founder and majority shareholder of Iron ore miner Ferrexpo PLC (FXPO), so let us just say he is a colourful Ukrainian entrepreneur, one of the original oligarchs who, finding himself in the right place at the right time, acquired some promising assets for a song and listed his company in London in 2007.