Anyone seen the movie called the Crucible?
This seems to be spiraling into that direction. Someone has been branded a "Saxon" and suddenly the player is unwelcome in nearly all aspects of game play and mind you not because of something he did but because of his label. We as players must be willing to forgive, it happened and judgement was passed in the past now while he was branded a member of the Saxon clan he alone is not a clan, he is an individual now if the case came along where he and five of his business suddenly emigrated to the same realm, then at that point you could consider a possible clan junction.
I personally feel as if the fear is unfounded, the accusation and the demand both unreasonable and not only unreasonable but anti-community, we are after all players of one large game that requires all of our participation to enjoy.
Furthermore on the discussion of clans every realm, every single one has a small clan within it's leadership it's psychologically inevitable it's why Generals, Bankers, Rulers, Judges remain the same people thought out the course or a majority of the course of the realms existence. People work together, familiarize among one another creating a social circle and degree of familiarity they are are comfortable with. As time goes by they speak among one another outside of the game, tell jokes, talk about other realms and slowly but surely even if unknown to themselves become a clan, as they expand and one of them decides to no longer sit in a position of power they still remain within the circle but allow another in it.
Its's the inevitable social construction, so in closing. Simply being a clan should not be illegal as it was stated earlier but it should only be illegal if that clan through it's actions as Tom stated "to play the game as you would play a board game with good friends, and to value fair play above any victory or power." The concept of roleplay people often forget is while the player is invincible and receives no harm in the bout of role playing (unless a fellow player at a D&D gathering throws a d20 in your eye....) the character is not, I always follow the rule of "!@#$ happens" when role playing, characters are not meant to ever die an epic death, outlive all his friends, or save the world from evil or get the girl or for some a guy at the end. Sometimes they get hit by a bus, trampled by a stray horse, catch tuberculosis, die of a nick that got infected or catch a STD. You won't always win and that is where the greatest of fun sits, to try and achieve greatness in the face of adversity and through ambition of others however it should be done fairly. So that others may commit to the same ideals of fun and adventure yet "fairly"