A Labor senator has launched a scathing takedown of the government's farm invasion laws, despite intending to toe the party line and vote for the bill.
Under the legislation, targeting "extreme" vegan protesters, people inciting property damage or destruction could face five years in jail.
Provoking trespass on agricultural land would be punishable by up to one year behind bars.
In a fiery speech to parliament on Wednesday, opposition backbencher Kim Carr said the legislation needed extensive changes to guard against unintended consequences.
"There is a real serious risk here that when you undermine the capacity to provide that whistleblowing service that people do provide, the work that journalists do, that you actually enhance organised crime," he said.
Labor Party rules prevent senators and MPs from crossing the floor to vote against positions reached in caucus.
On Tuesday, Senator Carr told a caucus meeting he wasn't happy about capitulating to the government on the issue.
Senator Carr warned the definition of agricultural land was too broad and could include research facilities, along with food and meat processing plants.
"To act in haste and to draft legislation which is badly thought through may have serious consequences for some considerable time," he said on Wednesday.
He said states and territories already had laws dealing with both trespass and incitement.
Government minister Zed Seselja cheekily interrupted Senator Carr's speech to question whether Labor supported or opposed the bill.
The ALP senator suggested the "ignorant" Senator Seselja should borrow his hearing aids.
Earlier, Senator Seselja said the bill was about supporting farmers who provide food and fibre for Australia.
"The Greens have of course made it clear they are on the side of the vegan terrorists," he said.
Greens animal welfare spokeswoman Mehreen Faruqi said the major parties were on the "wrong side of history", branding the move an "ag gag" to protect large agriculture corporations from scrutiny.
"This is an anti-protest bill dressed up as protection. It takes us further down the road to a police state," she told parliament.
Senator Faruqi said anyone who thought the offences were about protecting mum and dad farms had the wool pulled over their eyes.
The coalition moved to create the offences after a controversial online map detailed farmers' information in a bid to expose animal cruelty in agriculture.
Nationals senator Perin Davey, who lives on a farm near Deniliquin in NSW, said she was lucky to not have woken up to vandalism or harassment of animals.
"I do live in fear it could happen any day - and not just to myself and my family - but the families who also live on that same property who may be innocently targeted," she said.
Australian Associated Press