3HO is not an offshoot of Sikh's anymore than 'moonies' are an offshoot of Christianity. 'Moonies' think their leader is Jesus incarnate. 3HO members worship Yogi Bhajan and the worship of humans is expressly forbidden in the Sikh religion. The violation of the tenets of the Sikh religion go on for pages and the leaders follow almost none of them. This one was the biggest and most obvious violation until recently.
There are lots of them here http://forums.delphiforums.com/Kamallarose/start but I think the best indication is that there is not a single native Indian Sikh out of 300 members at their home in Espanola and there were only about two Indian Sikhs in the entire membership at the headquarters in Los Angeles. The real Sikh's know it's a fraud.