The rejection of sweeping anti-protest powers around places of worship in NSW might serve as a warning to other states, a protest rights campaigner says.

The NSW laws were implemented swiftly in February after a spate of anti-Semitic acts across Sydney and Melbourne, including graffiti, arson attacks and threats of violence.

But Palestine Action Group activist Josh Lees took the NSW government to court, arguing it was unconstitutional to give police bolstered powers to move on protesters near places of worship.

The lack of clarity around the reach of the legislation or the definition of nearness meant the measure wasn't fit for purpose and would have a chilling effect on protesting in NSW, he argued.

Supreme Court Justice Anna Mitchelmore on Thursday agreed, ruling the provision was

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