right of access to the institutions, and of due participation in the
activities of the nation. In my opinion the reasons for the
decision are conclusive as to all parts of Australia. A great deal
of that which it is usual to call the "police power," the "right of
self-defence" in respect of such matters as internal order, or the
safety, health and morals of the people of the State, is probably
affected by this new right. It is not for us to-day to determine
the extent to which that may be the case, and, indeed, it can
only be determined in concrete cases as they arise. It is probable
that the right of the citizen, so far as it may be described by
the word " intercourse," is not carried much further by sec. 92 of
the Australian Constitution than the fact of union necessarily
carried it, though the express prohibition of that section against
restriction no doubt makes the Australian Charter much stronger
than the American in respect of trade and commerce. I must
by no means be thought to say, and it is quite unnecessary to
decide, either that the fact of federation or that the language of
sec. 92 destroys the right of individual States to take any pre-
cautionary measure in respect of the intrusion from outside the
State of persons who are or may be dangerous to its domestic
order, its health, or its morals. But whatever may be the residue
of power left to the State in this regard, it is clearly limited by
the existence of some necessity for the defensive precaution, And
this, I think, is where the answer to the application fails. See.
3 of the State Act of 1903, now in question, brings within its
interdict any person who, subject to the exception with which
the section begins, has been convicted in any other State, "(b) of
an offence for which in such State he was liable
to be imprisoned for one year or longer." This provision, if
valid, authorizes the punishment of such a person, though the
offence of which he has been convicted outside the State has been
of trivial import; though it has deserved and received a punish-
ment of only a few hours or days, and though for nearly three
years he has as a free man led a blameless life, so long as, under
some arbitrary classification, the offence is one for which in an
extreme case an imprisonment for one year might have been
allotted.