Neo-Nazis have previously been allowed to protest outside NSW parliament without intervention from police or the Minns government in one of a string of increasingly brazen gatherings by the extreme right which have tested police powers.

Police and the state government are investigating how 60 black-clad neo-Nazis were able to hold a rally against Jewish groups outside Parliament House on Saturday.

The rally has sparked anger within senior police ranks and the Minns government. Commissioner Mal Lanyon has said a “communications error within the police force” meant neither he nor Premier Chris Minns were informed about the gathering despite the group giving notice on October 28 of their intention to hold the rally.

On Sunday, Penny Sharpe, leader of the government in the Upper House, said

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