This from the copy of a section 32 of an auction I recently attended .
Heading ; It is an offence to disrupt and auction .
The law forbids an intending bidder or a person acting on behalf on an intending bidder from doing any thing with the intention of of preventing or causing a major disruption to , or causing the cancellation of , a public auction .
If NSW law is the same or similar to Vic those folk are in trouble .
