Sweeping anti-protest police powers have been declared invalid after they were rushed through a state parliament despite concerns from faith leaders and legal experts.

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

But Palestine Action Group activist Josh Lees took the NSW government to the state's supreme court, arguing it was unconstitutional for police to have 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 it wasn't fit for purpose and would have a chilling effect on protesting, he argued.

NSW Supreme Court judge Anna Mitchelmore on Thursday agreed, ru

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