Queensland’s new anti-corruption watchdog takes up its charge today, but some have questioned changes they say will render it useless.

Queensland Attorney-General Jarrod Bleijie says the state's newly-renamed Crime and Corruption Commission (CCC) will be able to "fearlessly and effectively" tackle crime and corruption in a way it was previously unable.

But former Queensland corruption fighter Tony Fitzgerald has launched a scathing attack on the changes and the Queensland Government’s legal direction.

A recent overhaul transformed what was known as the Crime and Misconduct Commission (CMC) into the new CCC.

Along with the name, a number of controversial changes were made to the way it operates.

The Queensland Government removed the need for bipartisan agreement in selecting the head of the watchdog.

It means whichever party is in power can choose who is in charge of the anti-corruption commission.

Secondly, the trigger for an inquiry has been tightened, so that only “serious cases” will actually be investigated.

As part of this, all complaints to the CCC must now be in a statutory declaration.

In a move toward transparency; the hearings of the CCC’s overseeing committee - the Parliamentary Crime and Corruption Committee – will now be open to the public

Mr Bleijie says the watchdog is now “unmuzzled”, but will be under more scrutiny than ever.

The changes were condemned over the weekend in a public letter by Tony Fitzgerald, the QC who presided over the massive Police corruption findings in the ‘Fitzgerald Inquiry’ of the late nineteen-eighties.

Mr Fitzgerald says the Queensland Government has “flaunted its disdain for democracy and good governance” by attacking the state's Crime and Misconduct Commission (CMC) and the independence of the judiciary.

He has recently criticised the Government’s appointment of Tim Carmody as Chief Justice of the Supreme Court, questioning whether the Judge has been too supportive of government policies

“People whose ambition exceeds their ability aren't all that unusual,” Mr Fitzgerald said following the appointment.

“However, it's deeply troubling that the megalomaniacs currently holding power in Queensland are prepared to damage even fundamental institutions like the Supreme Court and cast doubt on fundamental principles like the independence of the judiciary.”

“Queensland is extremely vulnerable to the misuse and abuse of power,” he said.

“There are almost no constitutional limits on the power of the state's single house of parliament.”