When Does a Religion Become a Cult? "Many academics and observers of cult phenomena, such as psychologist Philip G. Zimbardo of Stanford, agree on four criteria to define a cult. The first is behavior control, i.e., monitoring of where you go and what you do. The second is information control, such as discouraging members from reading criticism of the group. The third is thought control, placing sharp limits on doctrinal questioning. The fourth is emotional control—using humiliation or guilt. Yet at times these traits can also be detected within mainstream faiths. So I would add two more categories: financial control and extreme leadership."