http://www.youtube.com/watch?v=pL2sffgYXwY&feature=&p=825EE416379D8F72&index=0&playnext=1

Those who have not been online for more than 30 days or VAC banned will be removed from the group.
Also if you know you are not going to be active anymore (difference from being online) please remove yourself from the group or ask an admin to.
If you would like to rejoin, ask an admin to send you an invite.

http://www.youtube.com/watch?v=iZc0hh7s5mc