Participants of the “Returning the Names” ceremony traditionally gather at the Solovetsky Stone memorial — installed in 1990 outside the former KGB headquarters in Moscow — on Oct. 29 to read the names, ages and professions of those who died in Stalin’s purges. The Memorial human rights group says it has reached an agreement with Moscow city officials to hold an annual commemoration of the victims of Stalinist terror, days after the authorities withdrew permission for the event. On Monday evening, Memorial said that after a “constructive meeting,” Moscow authorities had agreed to allow the annual ceremony to be held...