The Indian spiritual entrepreneur Maharishi Mahesh Yogi took the West by storm in the 1960s and '70s, charming Baby Boomers fed up with war and social upheaval with his message of meditation and peace. Heeding his call, two thousand followers moved to tiny Fairfield, Iowa, to set up their own university on the campus of a failed denominational college. Soon, they started a school for prekindergarten through high school, allowing followers to immerse themselves in Transcendental Meditation from toddlerhood through PhDs.

Although Fairfield's longtime residents were relieved to see that...