Answer
Sergei Magnitsky was a Russian lawyer who was posthumously convicted along with Browder in Russia for tax fraud. Magnitsky was a lawyer for Hermitage Capital Management, an investment firm founded by Browder. In 2005, Magnitsky uncovered a massive tax fraud scheme involving Russian officials. Magnitsky was arrested and charged with tax evasion and other crimes. He died in prison in 2009 after being denied medical treatment.