Katter backs Spencer, asks who owns land

The long-running Federal Court case of southern NSW farmer Peter Spencer strikes at the heart of land ownership in Australia, Queensland federal MP Bob Katter says.

Mr Katter has flown to Sydney to support Mr Spencer's legal case against the Commonwealth and the NSW government over land-clearing laws.

He argues restrictions imposed on the clearing of vegetation on his farm constitutes an acquisition of his property.

Speaking outside the court on Thursday, Mr Katter told reporters that the case, which was launched in 2007, was one of the most important in Australia's history.

"Today the question is: who owns the land, the crown or the people?

"If we don't own our own land and a bunch of half-witted politicians own our land, than God help us all.

"This is why I have tracked across Australia to support Peter."

It comes more than four years after Mr Spencer staged a 52-day hunger strike in 2009 and 2010 on a suspended platform on his former property at Shannons Flat, near Cooma.

The leader of Katter's Australian Party said "millions of dollars worth of timber and timber rights" had been taken off Mr Spencer without compensation.

The matter continues.