Accusations made against doctor connected to NXIVM

Dr. Brandon Porter is under investigation by the New York State Health Department for allegedly conducting research studies on the self-help group's members.
3:13 | 05/07/18

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Transcript for Accusations made against doctor connected to NXIVM
We'll turn now to disturbing new allegations against the mysterious self-help group nxivm. The leader in addition to the actress Allison Mack appearing in court and now there are troubling accusations against a doctor connected to the group. Amy, I know you've been following the story. I have and, robin, I have to say these are haunting stomach-churning allegations. A former nxivm member saying a doctor described as the group's resident physician forced her to watch videos depicting acts of extreme violence and filmed her reaction. This morning, U.S. Attorneys say more arrests are imminent in the case against nxivm. The organization accused of branding women and forcing them to act as sex slaves. Do you have anything to say. Reporter: With Allison Mack coming face-to-face with reporters outside federal court Friday avoiding questions as she faces sex trafficking charges in connection to her alleged involvement with the organization she once promoted in videos like this. When I first came I had on the surface something that seemed to be like the perfect life for a pretty good life. Reporter: Best known for her role in "Smallville." I can explain later. I did what I had to do. Reporter: Appearing in court for a pretrial hearing seated near Keith raniere said to be nxivm's leader. The pair in this video released by the organization. One would say authenticity is being as you are and expressing as you are. I don't know why but it makes me want to cry. It's beautiful. Reporter: Prosecutors say Mack actively worked on recruiting women for raniere. In 2016 Mack reached 0 out to Emma Watson tweeting I'm a fellow actress like yourself and involved in an amazing women's movement I think you'd dig. I'd love to chat if you're open but Watson never responded. Raniere's attorneys say nxivm's members aren't forced into joining the group or participating in any activities. Women joined of their own volition for their own reasons and as part of what they felt they wanted to sort of accomplish in life. Reporter: Both Mack and raniere pleaded not guilty as ABC news learned a medical doctor said to be affiliated with the group is now under investigation by the New York state health department for allegedly improperly conducting research studies on members. Documents obtain the by ABC news outlining charges against Dr. Brandon porter, accusing him of moral unfitness, gross negligence and gross incompetence saying among other things that porter allegedly performed an unsanctioned fright study on nxivm group members including allegedly recording them and monitoring their brain activity as they watched graphically violent videos depicting murder and sexual assault. Now, porter has been charged by a New York state oversight board with illegally conducting human experiments. His accusers say he may have performed the so-called fright study on up to 100 people. Keith raniere and Allison Mack have denied any wrongdoing, robin, so this continue. I'm telling you what, when you get into the details and we can't share all of them here, frightening. What we hear is bad enough. Thank you.

This transcript has been automatically generated and may not be 100% accurate.

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