One winter morning, prisoners at the Akmola Labor Camp for Wives of Traitors to the Motherland, part of the Soviet gulag system from the 1930s to 1950s, trudged to a nearby lake. As they began gathering reeds to heat their frigid barracks, children and elders from the neighboring community approached the shore. The kids hurled small, hard white balls toward the women, and the camp guards cackled: Their charges weren’t hated only in Moscow, but here in remote Kazakhstan as well, recalled Gertrude Platais, who had been arrested in 1938…