This was covered on another thread you posted at.
Here is a good working definition for a destructive cult as defined by a doctor that once taught at Harvard Medical School.
"Certain psychological themes which recur in these various historical contexts also arise in the study of cults. Cults can be identified by three characteristics:
1. a charismatic leader who increasingly becomes an object of worship as the general principles that may have originally sustained the group lose their power;
2. a process I call coercive persuasion or thought reform;
3. economic, sexual, and other exploitation of group members by the leader and the ruling coterie.
Also see [www.culteducation.com
Here are some "warning signs" regarding a potentially unsafe group or leader:
Absolute authoritarianism without meaningful accountability.
No tolerance for questions or critical inquiry.
No meaningful financial disclosure regarding budget, expenses such as an independently audited financial statement.
Unreasonable fear about the outside world, such as impending catastrophe, evil conspiracies and persecutions.
There is no legitimate reason to leave, former followers are always wrong in leaving, negative or even evil.
Former members often relate the same stories of abuse and reflect a similar pattern of grievances.
There are records, books, news articles, or television programs that document the abuses of the group/leader.
Followers feel they can never be "good enough".
The group/leader is always right.
The group/leader is the exclusive means of knowing "truth" or receiving validation, no other process of discovery is really acceptable or credible.
Here are some additional "warning signs" concerning those who become involved with potentially unsafe groups and leaders:
Extreme obsessiveness regarding the group/leader resulting in the exclusion of almost every practical consideration.
Individual identity, the group, the leader and/or God as distinct and separate categories of existence become increasingly blurred. Instead, in the follower's mind these identities become substantially and increasingly fused--as that person's involvement with the group/leader continues and deepens.
Whenever the group/leader is criticized or questioned it is characterized as "persecution".
Uncharacteristically stilted and seemingly programmed conversation and mannerisms, cloning of the group/leader in personal behavior.
Dependency upon the group/leader for problem solving, solutions, and definitions without meaningful reflective thought. A seeming inability to think independently or analyze situations without group/leader involvement.
Hyperactivity centered on the group/leader agenda, which seems to supercede any personal goals or individual interests.
A dramatic loss of spontaneity and sense of humor.
Increasing isolation from family and old friends unless they demonstrate an interest in the group/leader.
Anything the group/leader does can be justified no matter how harsh or harmful.
Former followers are at best-considered negative or worse evil and under bad influences. They can not be trusted and personal contact is avoided.