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Yuri Dmitriev, the 70-year-old Russian historian known for uncovering mass graves of Soviet-era political repression victims, was rushed from Penal Colony No. 18 in Mordovia to a prison medical facility after suffering a suspected stroke, according to the human rights group ZPCh. Dmitriev has been imprisoned for years on charges widely seen as retaliation for his historical research exposing Stalin-era atrocities.