The neo-Nazi organiser of an anti-Jewish rally outside NSW parliament has had his personal bank accounts frozen, as private-sector companies quietly move to cut off the group's financial pipeline, frustrating its ability to fundraise and recruit.

While federal and state governments, police and national security agencies grapple with how to respond to the National Socialist Network (NSN), the ABC can reveal several financial institutions and service providers have acted independently to restrict the flow of funds to the white supremacy group.

Jack Eltis, a 28-year-old part-time air-conditioning mechanic from north-west Sydney and the NSN's third-in-command, discovered on Monday that his bank accounts had been cancelled.

He told supporters he was unable to use his cards or withdraw cash.

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