An article by Paul Karp in The Guardian, 2 May 2017
..."Merkel described the law as “unusual” and without precedent in Australia because police powers to order protesters to move on and the automatic ban on them returning for four days were only enlivened when they agitated “political, environmental, social, cultural or economic issues”.
He said this was “content-based criterion” that meant the law directly targeted political communication, which is protected by an implied freedom in the commonwealth constitution.
Merkel said the law lacked a “rational connection” to preventing disruption of business which revealed its true purpose was to stop environmental protests."...