Hate speech laws targeting Nazis are being prepared after dozens of black-uniformed men shouted racist chants in a fascist gathering.

The hasty response comes after 60 demonstrators linked to the Nationalist Socialist Network assembled outside NSW parliament on Saturday.

They shouted Nazi slogans and unfurled a large banner with the slogan: "Abolish the Jewish Lobby".

Premier Chris Minns said he would aim to legislate laws cracking down on hate speech in coming weeks after attendees at the rally chanted "blood and honour", which is a Hitler youth slogan.

"The government is also exploring including (bans on) Nazi behaviour and speech alongside Nazi symbols to ensure there's no ambiguity about this horrifying behaviour ... and no suggestion launching a fascist protest on NSW streets will

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