Lies and Deceit in the name of 'Sat Nam'.
In 2013 Philip Deslippe,
an historian who used to practise Kundalini Yoga, wrote a scientifc article
'From Maharaj to Mahan Tantric'
about the lies Yogi Bhajan had told about his past, his teachers and
the origin of his version of Kundalini Yoga.
In 1977 Dr.Trilochan Singh
wrote an interesting book
'Sikhism and Tantric Yoga'
He is a renowned Sikh writer.
He knew Yogi Bhajan rather well and was very unhappy with the way YB intertwined yoga and Sikhism.
In the book, he gives details of YB's 1970 visit to India with 84 of his students. After that trip, 80 students dropped out. During this visit, Yogi Bhajan broke with his old teachers. From then on he also changed the stories he gave about the origins of his yoga knowledge.