to insurgency terrorism (i.e., Iraqi insurgency, 2017–present). The Shining Path guerrilla movement, active in Peru in the 1980s and 1990s, has variously been described as a "cult" and an intense "cult of personality". The Tamil Tigers have also been described as such by the French magazine L'Express. Anti-cult movements Christian countercult movement In the 1940s, the long-held opposition by some established Christian denominations to non-Christian religions and supposedly heretical or counterfeit Christian sects crystallized into a more organized Christian countercult movement in the United States. For those belonging to the movement, all religious groups claiming to be Christian, but deemed outside of Christian orthodoxy, were considered cults. Christian cults are new religious movements that have a Christian background but are considered to be theologically deviant by members of other Christian churches. In his influential book The Kingdom of the Cults (1965), Christian scholar Walter Ralston Martin defines Christian cults as groups that follow the personal interpretation of an individual, rather than the understanding of the Bible accepted by Nicene Christianity, providing the examples of the Church of Jesus Christ of Latter-day Saints, Christian Science, Jehovah's Witnesses, and the Unity Church. The Christian countercult movement asserts that Christian sects whose beliefs are partially or wholly not in accordance with the Bible are erroneous. It also states that a religious sect can be considered a cult if its beliefs involve a denial of what they view as any of the essential Christian teachings such as salvation, the Trinity, Jesus himself as a person, the ministry of Jesus, the miracles of Jesus, the crucifixion, the resurrection of Christ, the Second Coming, and the rapture. Countercult literature usually expresses doctrinal or theological concerns and a missionary or apologetic purpose. It presents a rebuttal by emphasizing the teachings of the Bible against the beliefs of non-fundamental Christian sects. Christian countercult activist writers also emphasize the need for Christians to evangelize to followers of cults. Secular anti-cult movement In the early 1970s, a secular opposition movement to groups considered cults had taken shape. The organizations that formed the secular anti-cult movement (ACM) often acted on behalf of relatives of "cult" converts who did not believe their loved ones could have altered their lives so drastically by their own free will. A few psychologists and sociologists working in this field suggested that brainwashing techniques were used to maintain the loyalty of cult members. The belief that cults