The former Greens leader challenged Tasmania’s anti-protest laws, under which he was arrested in January 2016 while trying to film logging activity in the state’s Lapoinya forest.
The Workplaces (Protection from Protesters) Act 2014 allowed police to break up protests before they started if they were on a business premises or an access area.
Dr Brown and Jessica Hoyt, who were arrested separately for protesting against logging in the Lapoinya forest, challenged the constitutionality of the laws in the High Court.
The High Court found on Wednesday that the laws were at odds with the implied right to freedom of political communication in the Australian constitution.
Hugh de Kretser, executive director of the Human Rights Law Centre (HLRC), said the decision was a win for Australian democracy.
“Free expression and the right to peaceful protest are essential to our democracy and must be protected. The High Court’s landmark decision protects these fundamental values,” he said in a statement.
He added that the Tasmanian laws were part of a broader trend among state governments in recent years aiming to stifle protests.
“Governments shouldn’t be able to sell off our democratic rights in order to protect business interests,” Mr de Kretser said.
“The High Court’s decision strikes down key parts of this excessive legislation that led to the arrests that sparked this case. The Tasmanian government should now scrap the legislation entirely.”
The court allowed the HLRC to intervene in the case, represented by DLA Piper as amicus curiae.
Professor Adrienne Stone, the director of the Centre for Comparative Constitutional Studies at Melbourne Law School, told Lawyers Weekly the lack of clarity in the legislation also contributed to its undoing.
“What emerges, which is very interesting although in my view not terribly surprising, is that the validity of laws like this will depend quite a lot on the detail of the way they operate,” she said.
“The thing that brought this law down was a lack of clarity as to how it operated in relation to forestry land. It made it difficult for protesters to know whether or not they were actually infringing the act, and it also made it difficult for police to know whether or not there was any infringement taking place.
“And given that problem, the High Court said ‘Look, it is perfectly legitimate for a state ... to regulate protesters in a way that seeks to prevent disruption to businesses, but they need a law that has a clearer operation’.”
Dr Brown said, “Today is a great day for the forests, wildlife and all of nature in Tasmania and around Australia. And a great day for the fundamental right of Australians to peaceful protest.”