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----"Eight years ago as UK Prime Minister and chair of the G20, I tried to end the injustice of global tax havens. But as the Paradise Papers leak shows,It’s one of today’s greatest injustices, allowing the richest to stand aside while the rest of us pay for health, education, and protecting the most vulnerable.But now we have a chance to stop it -- through anAnd the G20, the leaders of the world's biggest economies, can make it happen.Please join me in signing this open letter to Argentine President Mauricio Macri, chair of the G20 —, asking him and other G20 leaders to take urgent action to-- Gordon Brown, Former Prime Minister of the UK -- with Avaaz