Judge Jennifer Atkinson said the actions were carried out as part of organized activity and were intended to inflame tensions between communities.

Rabbi Eli Schlanger was among at least 15 people killed in the shooting at the Chanukah celebration at Bondi Beach.

Author Ayaan Hirsi Ali tells Sky News, 'I think it’s important for us to know that the Free Palestine movement is made up of a mish-mash of Marxists, Maoists and Islamist elements.'

'Jews in particular should feel uncomfortable, and it’s our duty to make them feel uncomfortable.'

Swastikas and slogans such as 'Hitler on top,' 'Allah hu Akbar,' 'Free Palestine,' 'F**k Israel'' and 'Jew dogs' were spray-painted on the building’s exterior walls.

'We cannot allow ourselves to become desensitized to acts of Jew-hatred and allow illegal conduct such as this to become normalized,' NSW Jewish Board of Deputies president said.

'Palestinian' activists had gathered outside Sydney's Great Synagogue during an event at held by the Israel Institute of Technology, Technion.

Last week, antisemitic vandals in Sydney spray painted anti-Israel slogans on cars, torched vehicles and damaged buildings.