Doesn't seem to be possible!
Highlight the Group, go to the menubar, Contacts > Edit > Delete Group
Doh! I was trying to right click, select and delete, command-delete, drag out...didn't even think to check the edit menu! :-p
no way to delete or edit groups in contacts mountain lion 10.8.5
Is there a simple solution?
The above should work.
well I create a new admin user account and bug is fixed. so many down time
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