code: def delete(group_id):
      
      group = Group.query.get_or_404(group_id)
  
      if group.can_edit(current_user):
          try:
              group.delete()
          except Exception as e:
              flash(str(e), "error")
              return redirect(url_for(".index"))
  
          flash(_('Successfully removed group "%(group_name)s"',
                  group_name=group.name), 'success')
          return redirect(url_for(".index"))
  
      flash(
          _(
              'You cannot delete the group %(group_name)s',
              group_name=group.name
          ),
          'error'
      )
      return redirect(url_for(".index"))
docs: Delete group.