The term is often applied to those whom the Church perceives as its enemies, such as those whose "disastrous" and "suppressive" acts are said to impede the progress of individual Scientologists or the Scientology movement.
One of the reasons Scientology doctrines portray Suppressive Persons as such a danger is that they are supposed to make people around them become Potential Trouble Sources (abbreviated PTS). Scientology defines a PTS as "a person who is in some way connected to and being adversely affected by a suppressive person. Such a person is called a potential trouble source because he can be a lot of trouble to himself and to others." Hubbard suggested that Potential Trouble Sources make up 17.5% of the population.
