I'm going briefly off-topic here to alert readers that the Covid information posted above is glaringly incorrect and, quite frankly, dangerous.
Okay, back to the topic at hand.
The paper mentions this book, Malignant Pied Pipers of Our Time
From a review of the book on Amazon:
As a former member of a cult this study really hit home for me. My wife and I struggled for years trying to understand how we could have been so readily drawn into the Children of God. Thank God we found our way out. We did not suffer many of the aftereffects many ex members do but some of our friends did. A malignant Pied Piper emerges when an individual with a Narcissistic Personality Disorder finds a population who need a leader to take over the responsibilities of life for them and tell them what to do. They become dictatorial and usually sexually exploitative. When they take the next step and become involved in the occult they can become malignant and violent.