The Anonymous protest in front of Scientology centers on April 12, 2008, were designed to focus primarily on one Scientology policy in particular: disconnection. Whenever someone is designated by the Church of Scientology as an antisocial personality, Potential Trouble Source (PTS), or Suppressive Person (SP), Scientologists may be instructed to have nothing whatsoever to do with them. If a conversation is absolutely necessary, it must be in the presence of Scientology representative.
If the person to be disconnected from is an outsider, disconnection is easy, but if that person is a former Scientologist with friends or family still in the Church, then disconnection means breaking up friendships, families, and even marriages. Why would people go to such an extreme as disconnecting themselves from spouses, children, and other family members? Scientologists are taught that continued contact with a Suppressive Person might inhibit their own progress in Scientology teachings.
In fact, failing to obey orders to disconnect from a Suppressive Person might itself be deemed a Suppressive Act, leading to that Scientologist also being declared a Suppressive Person who can no longer get Scientology training and from whom others must disconnect.
According to the Church of Scientology:
A Scientologist can have trouble making spiritual progress in his...training if he is connected to someone who is suppressive or who is antagonistic to Scientology or its tenets. He will get better from Scientology, but then may lose his gains because he is being invalidated by the antagonistic person. In order to resolve this, he either handles the other person's antagonism with true data about the Church, or as a last resort when all attempts to handle have failed he disconnects from the person.
Source: Scientology Catechesim
Doubt, skepticism, and questioning are intolerable for religions which are themselves insecure in some fashion - whether that insecurity means being unsure of the religion's doctrines or just not being socially secure in the overall community. The Church of Scientology is not at all unusual in this, but they do seem to me to be a lot more intolerant of doubt and skepticism than any other religious group I've written about. The more I read about it, the more I have to wonder why motivates them to protest so loudly against critics when they are treat skepticism so negatively.