What exactly have they been charged with?
drj,
on a brief reading of the appropriate NSW leg,
the APEC Meeting (Police Powers) Act 2007,
it would appear at least one charge may find support in sub-s 19 (1):
"19 Offence: entering restricted area without special justification
(1) A person must not, without special justification, enter a restricted area or any part of a restricted area.
Maximum penalty: 6 months imprisonment or, if circumstances of aggravation exist in relation to the offence, 2 years imprisonment.
...",
as to restricted area, see s 7,
as to circumstances of aggravation, see sub-s 19 (2) (dealing with sub-s 19 (1) whilst in possession or in control of a prohibited item - for prohibited item, see sec 3 defs),
as to special justification, s 37:
"37 Special justification
(1) For the purposes of this Act, a person has a "special justification" to be in an area or to possess or be in control of a thing only in the circumstances provided for by this section.
(2) A person has a special justification to be in an area if:
(a) the person is a police officer who is on duty in the area, or
(b) the person is required, authorised or permitted to be in the area by the Commissioner or a police officer, or
(c) the person is required to be in (or pass through) the area for the purposes of the person's employment, occupation, profession, calling, trade or business or for any other work-related purpose, or
(d) the person resides (whether on a temporary or permanent basis) in premises that are located in the area, or
(e) the person is in the area in such other circumstances as may be prescribed by the regulations.
..."
I have highlighted the special justification element as, by memory, the ABC released a statement claiming the chaser team had, in effect, permission to enter as they had been waved through by successive police checkpoints before finally stopping or being stopped.
Further, of some interest, this Act has a short shelf life, it commenced on 4/7/07 (date of assent, s 2) and is to be repealed "at the beginning of" 13/9/07 (repeal of Act, s 41 (a))
cheers