Putin’s Iron Grip on Russia Suffocates His Opponents By CLIFFORD J. LEVY NIZHNY NOVGOROD, Russia — Shortly before parliamentary elections in December, foremen fanned out across the sprawling GAZ vehicle factory here, pulling aside assembly-line workers and giving them an order: vote for President Vladimir V. Putin’s party or else. They were instructed to phone in after they left their polling places. Names would be tallied, defiance punished. The city’s children, too, were pressed into service. At schools, teachers gave them pamphlets promoting “Putin’s Plan” and told them to lobby their parents. Some were threatened with bad grades if they...