dispute. It is not difficult to conceive of a demand made upon
their actual employers by a body of employees acting in concert
insisting that they shall not take into their employment workmen
who receive less wages or less favourable conditions of employment
than they do. The causes of such a demand, no doubt, would
include the fear that the maintenance of existing wages and con-
ditions was threatened by the competition of non-unionists. But
differential treatment of employees working side by side may provoke
an unrest which is based on feelings more instinctive than reasoned
but none the less real and intense. The difficulty lies not in acknow-
ledging that such cases may arise but in defining them. At one
extreme, it may appear to the Commonwealth Court of Conciliation
and Arbitration to be imperative, in order to avert a dislocation of
industry, that it should give effect to a demand on the part of the
employees that some limit should be placed upon their then employer's
liberty to engage non-unionists on such terms as he pleases. But
it is evident that, at the other extreme, it may be no more than
an expedient to overcome the want of power to make a common
tule affecting employers who do not, as well as those who do, employ
members of the disputant organization. This, in my opinion,
cannot be done. It cannot be done for the reason that no industrial
dispute could arise which would support an award prescribing the
terms and conditions upon which employers, who never employ
members of the disputant organization, may employ persons who
are not members of that organization. An industrial dispute involves
some disagreement between the co-operators in industry, whether
individually, by groups, by classes, or by representation, and in such
a case there is no co-operation. To me it seems something like a
contradiction in terms to describe as an industrial dispute the failure
to comply with a demand made by a body of employees upon an
employer, who has never employed any of them, as to the terms and
conditions upon which he shall employ strangers to them. No doubt
the conception of industrial dispute has, under the influence of judicial