Police said the group recruited students aged 18 to 24 years and used mental manipulation to get them to abandon their studies and promote charismatic American leader Lyndon LaRoche to be the next US president.
“It blames the Jewish people for the Iraq war and other problems in the world,” police said.
“Jeremiah’s lecture notes showed the anti-Semitic nature of the ideology.”
Dennis King is the author of the book Lyndon LaRouche and the New American Fascism, and has followed Mr LaRouche’s career with interest.
He said he could believe that Mr Duggan had reacted badly to the movement’s techniques, which could have caused him to run in a “state of terror” from where he was staying in Wiesbaden.
“They use a variety of techniques,” he said. “They try to persuade them to be part of their family, they love-bond them and give them work to do and build up that work until you are doing nothing else.
“It turns into a 24-hour operation – they are sucked in and they are totally in the group.”
But he explained that Mr Duggan could have reacted to the pressure he was put under or become frightened by the some of the more extreme ideas he was being introduced to.
“I think it is possible that he tried to leave and they might have tried to restrain him. Imagine being Jewish and thinking these people want to kill you in the long run.”