Neo-Nazi leader filmed repeatedly punching security guard at Channel Nine building

The assault happened hours before A Current Affair broadcast a segment on an Australian far-right group

The leader of an Australian neo-Nazi group has been filmed assaulting a Channel Nine security guard just hours before the network's A Current Affair broadcast a segment about the organisation.

Thomas Sewell, one of the leaders of the neo-Nazi group National Socialist Network, was filmed assaulting the guard on Monday afternoon after he and another man came to the network's offices in Melbourne before its tabloid current affairs program aired a segment about the group.