The High Court is hearing a challenge by lobby group GetUp to the constitutionality of amendments to the Electoral Act made by the Howard government.
The protester wearing a Liberal shirt was vocal standing ahead of the High Court Justice's arrival and beginning a verbal stoush with another man who told him to sit down.
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The protester then jumped the barrier .. leaping across tables where legal teams sat and onto the bench before being stopped by court officers and taken away by police.
A GetUp! spokesman later told AAP the protester was not from his organisation.
