<p>Viking rock music and whole pigs roasting on spits drew thousands of Swedes to a festival hosted by nationalists poised to deliver their country’s biggest political upheaval in a century.</p>
<p>The Sweden Democrats have been led since 2005 by a clean-cut and bespectacled man, Jimmie Akesson. He’s gentrified a party that traces its roots back to the country’s neo-Nazi, white supremacist fringe. Some polls now show the group may become the biggest in Sweden’s parliament after general elections on Sept. 9. Such an outcome would end 100 years of Social Democratic dominance.</p>