High Quality Content by WIKIPEDIA articles! Sofiya Vasilyevna Kalistratova (Russian: Софья Васильевна Калистратова), also known as Sofia Kallistratova (Софья Каллистратова; 6 (19) September 1907 – 5 December 1989) was a public defense lawyer in the Soviet Union. She defended various Soviet dissidents and from 1977 was a member of the Moscow Helsinki Group (MHG), distributing information about human rights violations in the Soviet Union.