As you might have noticed if you read this blog regularly, I’m fascinated by cults, communes, utopias and mass movements, when groups of people give themselves up to an idea that doesn’t necessarily mesh with reality. On that subject: Read “The Man Who Saves You From Yourself,” Nathaniel Rich’s excellent 2013 Harper’s profile of cult infiltrator David Sullivan. (Sullivan died from cancer just after its publication.) Here’s the opening:

Nobody ever joins a cult. One joins a nonprofit group that promotes green technology, animal rights, or transcendental meditation. One joins a yoga class or an entrepreneurial workshop. One begins practicing an Eastern religion that preaches peace and forbearance. The first rule of recruitment, writes Margaret Singer, the doyenne of cult scholarship, is that a recruit must never suspect he or she is being recruited. The second rule is that the cult must monopolize the recruit’s time. Therefore, in order to have any chance of rescuing a new acolyte, it is critical to act quickly. The problem is that family and friends, much like the new cult member, are often slow to admit the severity of the situation. ‘Clients usually don’t come to me until their daughter is already to-the-tits brainwashed,” says David Sullivan, a private investigator in San Francisco who specializes in cults. “By that point the success rate is very low.”

Sullivan became fascinated with cults in the late Sixties, while attending Fairview High School in Boulder, Colorado. It was a golden age for religious fringe groups, and Boulder was one of the nation’s most fertile recruiting centers, as it is today. (There are now, according to conservative estimates, 2 million adults involved in cults in America.) “You couldn’t walk five steps without being approached by someone asking whether you’d like to go to a Buddhist meeting,” says John Stark, a high school friend of Sullivan’s. Representatives from Jews for Jesus and the Moonies set up information booths in the student union at the University of Colorado, a few miles down the road from Fairview High. Sullivan engaged the hawkers, accepted the pamphlets, attended every meditation circle, prayer circle, shamanic circle. When the Maharishi Mahesh Yogi led a mass meditation session at the university, Sullivan was there, watching from the back of the lecture hall.

Sullivan was not religious. Though raised Catholic, by high school he considered himself a “hardcore atheist.” Before the family moved to Boulder, his father had managed a used-car dealership in Salina, Kansas. His mother worked in a pawnshop. On Thursday nights, during the late shift, Sullivan sat with her at the counter, where he met criminals, alcoholics, and grifters trying to stay one step ahead of bill collectors. He saw how people could be manipulated if you exploited their weaknesses. He learned about desperation and the lies people told to arouse sympathy. From his grandfather, a funeral-home director who, Sullivan suspects, forged death certificates for the local Catholic church, he learned how to keep a secret. The suicide of a gay priest was called a heart attack. The botched abortion of a pregnant nun was pneumonia.

During spring break in 1968, inspired by On the Road, Sullivan and Stark set off on a tour of the Southwest in Sullivan’s baby-blue Pontiac convertible. They visited Drop City in southern Colorado, eating brown rice and tofu under geodesic domes, and the New Buffalo Commune outside of Taos, New Mexico, washing dishes after the communal meal and hitting on the women. Stark remembers how excited Sullivan would become when he entered these communities. “He had a wanderlust, a powerful urge to immerse himself in these different cultures.” When they spent the following summer in Mexico City, Stark noticed that Sullivan had begun to speak with a Mexican accent.

“There was a soul-searching element of it,” says Sullivan. “But I was also curious to know what the gurus were getting out of it. And I wanted to figure out how they picked up all those girls.”

The spiritual groups, he soon realized, shared a simple tactic: they demanded that their followers suspend critical thought. “They’d say, ‘You have to break out of your Western mentality. You’re too judgmental. You have to abandon your whole psychological-intellectual framework. Your obsessive materialism is blocking you from seeing the truth.”

“I became disturbed by how dramatically they transformed people, and in such a short period of time. They could take some regular American kid and all of a sudden he’s wearing saffron robes, walking around barefoot, all painted up, with a tiny ponytail and shaved head, dancing for hours, selling flowers and incense, living on the floor and eating disgusting food, repeating Hare Krishna, Hare Krishna, Krishna Krishna, Hare Hare, Hare Rama.”•