The Hidden Brotherhood is accepting ALL Assassins that are willing to join. The only requirement is that you must be an active player. To join go to http://assassinsnetwork.ubi.com/
and sign in to your uplay account. Once signed in go to clans and search up Hidden Brotherhood and request to join. Another way is to email me at email@example.com and give your playstation username and I will invite you. I will email you back letting you know I've invited you and you have to go back to the website above and go to clans and accept the invite. Unfortunately Hidden Brotherhood is only on PS3. Sorry XBOX users.