“I don’t want my name in this,” says Grace*, a 40-something mother from central California. “Or Zak’s*. Actually, even the cult, can you change that too? Because they have their bots. They’ll come after us.” It was 2023 and Zak was 18, a bright teenager starting at an Ivy League college. But it was his first time living away from home, and the pressure was beginning to take its toll. So he joined a yoga class to help him relax. It was affiliated to a bearded Indian guru from Mysore, India, in the Maharishi mould. And within a couple of...