Well, this sounds pretty abusive, but I think it depends on the nature of the group's purpose and how it is set up. I find "process" groups with little focus can tend to fragment. I also think a weak leader, and co-leader can affect group dynamics, but once again, are these professionals in a professional setting? Are they not monitored in some fashion? What you describe sounds pretty savage, and I cannot imagine why it would be allowed. I have no idea why it would be okay that your right to terminate therapy (for whatever reason) would not be honored, and you would be harassed in this fashion. The description of events here sounds insane.