Anthony's frown deepened. "Wait... when they put the new wards around the town to restrict the movement of purebloods, they used Dark magic?" He considered that for a moment. "Was it just as a shortcut or did they have something else in mind? Could they be working for Lestrange's group?
He snorted. "You're assuming they'll confess at all. And that they're still at the Ministry or worked there in the first place. I mean, how difficult would it be for someone to infiltrate a group of people working here back then? If they knew how to make Polyjuice or had the money to buy it, it would have been easy enough."