"Difficulties arise in proving a purpose for which
a person engages in particular conduct. There may
be many purposes activating that person, but under
s 45D(2) if one of the purposes is that
proscribed by s 45D(1) than that person
contravenes the section. It may be said that a
person intends the natural consequences of his
acts and that accordingly if, as a necessary
effect of conduct engaged in for a purpose,
substantial loss or damage is caused, then, of
necessity, that conduct is engaged in for purposes
including a purpose of causing substantial loss or
damage. In my opinion, such a conclusion does not
follow. The plaintiff carries the onus of proof,
albeit on the balance of probabilities and albeit
to establish a prima facie casr in the sense
already described. There is no provision by which
the onus is shifted to the defendants: cf s 5(4)
of the Conciliation and Arbitration Act. It is
well to remember the words of Viscount Cave L.C.
in Sorrell v. Smith (1952) AC 700; (1925) All
ER Rep 1. An issue in that case was whether a
combination of two or more persons for the purpose
of injuring a man in his trade was unlawful and,
if resulting in damage to him, was actionable.
The Lord Chancellor said (AC at 715): 'That the
defendants combined in a proceeding, the necessary
effect of which would have been to injure the
plaintiff in his trade unless he submitted to
their conditions, may be assumed; but did they do
so for the purpose of injuring the plaintiff in
his trade, or was it their purpose and object to
forward or defend their own trade? I am satisfied
that the latter is the true view. The learned
trial judge found as a fact that the defendants
were not actuated by any spite against the
plaintiff or by any intention or desire to injure
him. Their purpose was to defeat the 'distance
limit policy' of the retail federation, which they
considered injurious to the free sale of their
newspapers; and because the plaintiff, at the
instance of the retail federation and in concert
with them, was endeavouring to forward that policy
by withdrawing his custom from Ritchie's, the
defendants, as a counter move, declined to supply
Watson's with papers which they could hand on to
the plaintiff. Both moves were episodes in a
trade war which was being waged between the
retailers of newspapers on the one hand and the
producers and wholesalers on the other, and were
adopted in the supposed interests of one or the
other side. Stroke and counter stroke, whether
wise or not, were equally prompted by a desire
to forward or protect trade interests. The plaintiff
struck the first blow, and when it was countered
by a similar blow struck by the defendants ran to
the court for protection. His attitude recalls
the saying of a French author: 'Cet animal est
tre mechant; quand on l'attaque, il se
defend.' ("This animal is very dangerous; when
attacked it defends itself.") Apparently he
forgot that if the defendants were acting
illegally then so was he, and that if he was
acting illegally a court of equity would hardly be
disposed to help him. I think that in this case
it was proved that the defendants took action for
the sole purpose of protecting their own trade,
and accordingly that they have not committed or
threatened to commit any wrong and are not liable
to any proceedings.: see also McKernan v. Fraser
[1931] HCA 54; (1931) 46 CLR 343, per Evatt J. at 371."