Unification Church
The Unification Church has been called a cult for religious heresy, alleged corruption in its top leadership, mind control, and (in the past) fears that its members would commit mass suicide.
The church does have a novel view of the trinity (and of Jesus' divine nature), but is accepted as Christian to some extent. Allegations of corruption are based primarily on Rev. Moon's conviction in the early 1980s on charges of criminal tax fraud, although the amount allegedly underpaid was less than $7,500 and the case was initiated nearly ten years after the fact based on the first three returns Rev. Moon filed after coming to the US. The jury is still out on charges of mind control, with critics' accusations balanced by church insistence that its recruitment and indoctrination techniques are no different from any Christian denomination. Fears of mass suicide, played up in the aftermath of the People's Temple disaster of 1980, have not been realized in the succeeding two decades, and the church considers suicide a terrible sin (suicides go to hell).
Another criticism of the Unification Church is that it is centered to an extreme degree around its leader, the Reverend Sun Myung Moon, whom the members of the Church believe to be the Messiah. Of course, if he really turns out to be the Messiah that would prove this criticism invalid.
Others
Satisfied participants characterize Landmark, a derivative of est, as "just a business". Others, less charitably inclined towards the company, suggest that brainwashing might account for devotees' fanatical devotion to unpaid recruitment for Landmark seminars. The sometimes controversial reputation of founding guru (formerly known as "The Source") Werner Erhard often muddies debate on the alleged merits of Landmark's innovative (or psycho-babble) "technology".
The teachings, methods and results of Lifespring and its offshoots appear comparable to those of Landmark.
The exclusive branch of the Plymouth Brethren are considered as a cult by most other Christians, and non-religious observers as well.
The Church of the SubGenius has made numerous attempts to be included on lists of cults and controversial religious movements. This organization is widely seen as a humorous