This week's massive leak of confidential documents from the Panamanian law firm, Mossack Fonseca, has given unprecedented access to the way the rich and powerful have used tax havens to hide their wealth. But within the eleven and a half million documents, there is also evidence of how some of the shell companies set up by the firm, or the individuals that owned them, have been the subject of international sanctions and have been used by rogue states and oppressive regimes including North Korea ...
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