Lyudmila Alexeyeva (L), head of the Moscow Helsinki Group and Nataliya Magnitskaya, mother of dead anti-corruption lawyer Sergei Magnitsky, speak during an evening hosted by Russian opposition to remember her son in Moscow April 8, 2013. Magnitsky, a lawyer working for Hermitage Capital Management, once one of the biggest investors in Russia, was arrested shortly after accusing Russian officials of stealing $230 million from the state through fraudulent tax refunds. He died in November 2009, after nearly a year in jail during which he said he was denied medical treatment. REUTERS/Maxim Shemetov (RUSSIA - Tags: SOCIETY)