'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.