The Alliance pallet's init_members function is a root call with a check that only allows it to be called if there are no members yet. This makes the logic simpler, but Root should always have the ability to change the membership of the Alliance.

The function signature should be the same, but force_set_members would remove all current members and set each role according to the supplied parameters. If the call contains no members at all, it should clean up all storage items in the pallet, effectively disbanding the Alliance and removing their Rule and UnscrupulousList.