Московская Хельсинкская группа
Sofiya Vasilyevna Kalistratova (), also known as Sofia Kallistratova (; , Rylsk – 5 December 1989, Moscow) 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.