You can deactivate a group you belong to, even if you didn't create it. Deactivating a group prevents it from being added to more Conversations, disables new posts to its wall, and moves the group to the Deactivated list in the Groups panel. A deactivated group is not removed from the Conversations it already belongs to.
To deactivate a group:
Open the group, click , then select Deactivate Group.
To view deactivated groups:
From the navigation menu on the left, select Groups, then, in the Show menu, select Deactivated.
To reactivate a group:
Open the deactivated group, click , then select Activate Group.