They encourage or teach their members to only associate with their own group members and will isolate those members who are labeled “rebels” and discourage their members to speak with them.
If we are to maintain outside activities and have goals outside the group, then we are going to meet and make friends outside this group as well; and the Catechism (Cat. 1879, 1905 and 1910) quoted in the last section ensures freedom of expression and a fulfilling human nature which also makes certain we do not isolate ourselves to just the community at large. Indeed not only is this true for the individual, but should also be true for that community. Also equally important is that we do not isolate former members. For whatever reason they become former members, there should be due process or understanding. Even our Church has a due process for those who commit serious sins that require excommunication, and she doesn’t even stipulate that other Catholics should shun those who have or are in the process of excommunication. Yet this is not done to censor a person, but rather it is serious love in hopes that she can reach someone who has walked that far from Christ. Yet this doesn’t mean common courtesy and love are now checked at the door, but simply means they are under some punishment that is really none-of-our-business and this order comes from our Church leaders. We should think similarly with our individual communities, and if we provide the means for due process, allow for free communication, and have an open community then these instances should be rare. However, if they do arise the local law enforcement can tell one how to get an order of protection; if they cannot because it does not apply, then we might need to take a hard look at why we are isolating someone.