NSW Premier Chris Minns rammed through tough new laws in the wake of the Bondi massacre, when a father-son duo attacked a Jewish Hanukkah event and killed 15 innocent people in an alleged terror attack.
The package included tougher gun restrictions, strengthened hate speech laws and a controversial crackdown on public gatherings.
The police commissioner has been given the power to block protests for two weeks after a terrorist incident, and this declaration can be extended up to three months, which civil liberties groups say is draconian and infringes on the right to assembly.
It faces a High Court legal challenge.
Shortly before midnight, NSW Police Commissioner Mal Lanyon announced a declaration restricting public assemblies in Sydney in the South West Metropolitan, North West Metropolitan and Central Metropolitan policing areas for 14 days.
"The declaration will be reviewed and can be extended fortnightly for up to three months," police said in a statement.
"Gatherings are permitted but police may issue move on directions for people causing obstructions or behaving in an intimidatory or harassing manner, or people who might cause or be likely to cause fear in another person," they said.
Earlier, Indigenous groups have raised concerns that if the police commissioner makes the designation under his new powers and an extension is made, it could affect Invasion Day protests on January 26.
Mr Minns responded by saying such assemblies "can take place", indicating a distinction would be drawn between static rallies and marches through the city.
He said rhetoric about protesting being banned was overblown.
"The rules and the laws are only in place under very strict conditions and that is for a terrorism designation ... we've had very few terrorism designations over the last few years," he told reporters in Sydney.
"Right now ... it's the worst terrorism event in this state's history."
Former Supreme Court judge Anthony Whealy said it was important the NSW government restored goodwill in society following the attack, and that would not be achieved through divisive actions.
"If this law were in force now and the Jewish community want to protest themselves for what they saw as, for example, inadequate policing at the Hanukkah event ... they wouldn't be able to," he cautioned on ABC Radio.
The government has said the laws, labelled "dangerous and divisive" by the federal Greens, are not designed to stop peaceful gatherings.
Mr Minns said they were needed to stop hate speech running rampant, blaming pro-Palestine protests for breeding anti-Semitism that the organisers could not control.
It's something vehemently denied by organisers who say people are protesting Israel's war in Gaza and the actions of Israeli Prime Minister Benjamin Netanyahu's government.
"We want to make sure we're in a position to keep the people of NSW safe and I don't resile from the fact at all that in these circumstances of heightened tensions, words can lead to actions," Mr Minns said.
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