In this chapter, we focus on specific new Western religious movements, frequently referred to as cults, but that also might be termed “destructive” religious movements. "Destructive" elements include deceptive recruiting techniques, attempts to exert significant control over the minds and behavior of followers, abuse of followers, criminal activity, and violence or harm (including suicide) toward followers or others. A case vignette is presented, illustrating how the Branch Davidians under the leadership of Vernon Howell (AKA David Koresh) typified many of the characteristics of a Western religious cult. Common characteristics of leaders of Western religious cults are discussed, along with tactics commonly utilized by leaders to gain followers and to maintain control over followers. Common characteristics of followers are also discussed, and some prevalent myths about followers are dispelled. Psychological principles are discussed to the extent that they may shed light on the group and individual dynamics in play that may have contributed to some of the highly destructive outcomes that have occurred in some of these movements.