But when Mattes started tracking down the sites’ domain registrations, the trail led to Macedonia and Albania. In mid-September, he emailed a few of his private investigator friends with a list of the sites. “Very creepy and i do not think Koch brothers,” he wrote.
Mattes and his friends didn’t know what to make of his findings. He couldn’t get his mind around the possibility that trolls overseas might be trying to sway a bunch of Southern Californians who supported Sanders’ run for president. “I may be a dark cynic and I may have been an investigative reporter for a long time, but this was too dark ― and too unbelievable and most upsetting,” he said. “What was I to do with this?”