 The leading case, "Anti-Vivisection Society", sets out a strict rule that charities cannot campaign politically.An illustration of its strictness is "Bowman v Secular Society", where it was held that even when attempted changes to the law were ancillary to the main goals, it was still unacceptable.There is a dividing line; charitable trusts discussing political issues can be valid, as discussed by Hoffmann J "obiter dicta" in "Attorney General v Ross".