Animal rights activists who invade farms to stage protests will be hit with huge new fines in measures announced by Australia’s south-eastern state government after they were branded “domestic terrorists” by the region’s deputy leader.

The New South Wales (NSW) government has introduced on-the-spot trespassing charges of $1,000 for each “vigilante” caught illegally entering private farmland.

The new rules, which come into force on 1 August, could also see individuals charged up to $220,000 and corporations up to $440,000 for any major violations of the Biosecurity Act.

“Vigilantes who are entering our farmers’ property illegally are nothing short of domestic terrorists, NSW deputy premier John Barilaro, in remarks widely reported by Australian media.

“Our farmers have had a gutful. They don’t deserve, nor have time, to be dealing with illegal trespass and vile harassment from a bunch of virtue-signalling thugs.”

The penalties follows a series of demonstrations and direct action staged by vegan activists at private farms and abattoirs in recent months.

Earlier this year clashes between farm owners and protesters forced the police to step in Western Australia, and the owners of a small goat farm in Victoria blamed closure on continual harassment by abusive “vegan activists”.

Officials are also considering “jail time” as additional punishment. “Today the government is putting these vigilantes and thugs on notice,” said NWS agriculture minister Adam Marshall.