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After exposing corruption in some Russian companies, one high-level financial executive says he was expelled. He also says his lawyer was tortured and killed in the country. Bill Browder, the chief executive of Hermitage Capital, was adviser to the largest foreign investment fund in Russia at the time - we hear what he thinks of Russia's denial of the use of a nerve agent on a double agent and his daughter found unconscious in the UK.

(Image: Members of the UK's emergency services in green biohazard suits in Salisbury in the area where a man and his daughter were found unconscious. Credit: Ben Stansall/ AFP/ Getty Images)