Yogi Bhajan came to the US to spread the teachings of Kundalini Yoga, something he claimed was an ancient spiritual practice, but ...turns out he made the whole thing up and left a trail of sexual abuse and shady business deals along the way. 

Deslippe, Philip. “From Maharaj to Mahan Tantric: The Construction of Yogi Bhajan's Kundalini Yoga”

 Dyson, Pamela Saharah. Premka: White Bird in A Golden Cage. Eyes Wide Publishing. 2020

Scofield, Be. “Master of Deceit: How Yogi Bhajan Used Kundalini Yoga for Money, Sex And Power.” The Guru Magazine