JAMES GUBB was finishing off the knuckles when the Johannesburg Stock Exchange (JSE) shut him down. Trading single shares between two accounts, Mr Gubb had managed to “draw” the image of a fist with an upright middle finger onto the share-price chart for Oakbay Resources and Energy Limited, a company controlled by the Gupta brothers, cronies of President Jacob Zuma, that is at the centre of allegations of “state capture” in South Africa.