United States of Paranoia: They See Gangs of Stalkers

Nobody believed him. His family told him to get help. But Timothy Trespas, an out-of-work recording engineer in his early 40s, was sure he was being stalked, and not by just one person, but dozens of them. He would see the operatives, he said, disguised as ordinary people, lurking around his Midtown Manhattan neighborhood. Sometimes they bumped into him and whispered nonsense into his ear, he said. “Now you see how it works,” they would say.

http://www.nytimes.com