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Natalia Veselnitskaya, a Russian lawyer best known in the United States for lobbying against the Magnitsky Act. According to the New York Times, in Moscow she is regarded as a "trusted insider" who has argued cases for government agencies and high-profile clients including Pyotr Katsyv, an official in the state-owned Russian Railways, and his son Denis, whom she defended against a money laundering charge in New York. She has also been an informant in active communication with Yury Chaika, the Russian prosecutor general, since 2013. Starting in 2014, she had worked with Fusion GPS, the firm that was later hired to do opposition research on Trump, to investigate an unrelated money-laundering case involving Prevezon Holding, and the "dirt" she brought with her to the meeting stemmed from that work. The work on the Prevezon case, and later on the dossier, were completely separate, and Fusion GPS co-founder Glenn Simpson testified before the Senate Judiciary Committee that they were unaware that Ve