"Robert John Fardon should be behind bars and die in jail."

That's the message from Bravehearts founder Hetty Johnston, who says the release of dangerous serial sex offenders into the community is fuelling calls to reform how information about their whereabouts is disclosed to the public.

A supervision order dictating living arrangements and curfews for Fardon, one of Queensland's worst sex offenders, was lifted by a court last week.

Robert Fardon is now free to move about the community after a supervision order dictating living arrangements and curfews was lifted by a Queensland court. (9NEWS)

The order was only made public this morning.

Fardon has not offended, to the knowledge of authorities, while living in the community under strict supervision since 2013.

And while he will continue to be monitored for the rest of his life after the state government last year rushed through law changes, he will no longer be subject to curfews and will not be automatically required to wear an electronic monitoring device.

Ms Johnston has criticised the decision and says the fault lies within the system as a whole.

"The system is hiding these sex offenders in our communities," Ms Johnston said.

"It's great that police know where they are, but the community need assurances that if they're living in the community with this guy, if this guy is potentially living next door to them or having any contact with their children, that they will be informed.

"He can get in his car and be out of that postcode wherever he is, and in an entirely different postcode sitting on a beach, by a pool, watching kids and waiting for that opportunity."

Bravehearts founder Hetty Johnston. (9NEWS)

Fardon was first convicted in 1967, then aged 18, for sexual abuse offences against a 10-year-old girl, and over two decades he committed a series of rapes and sexual assaults.

In 2003, he became the first person to be jailed in Queensland indefinitely under new laws targeting repeat sex offenders.

However, he was then released on a supervision order in 2006, which he breached the following year.

Fardon was sent back to jail but was released again the same year and in 2008 was arrested over the rape of a 61-year-old intellectually disabled woman.

He was convicted and sentenced to 10 years' jail but the conviction was quashed on appeal. He was released on a supervision order in 2013.

Fardon, now 70, will be monitored for the rest of his life. (9NEWS)

9News understands when the order was lifted a week ago he was moved into a street filled with children.

"When he falls off the wagon, who's going to be in his way?" Ms Johnston said.

"This is what the community is railing against and this is why they want solutions, and even if they're bad solutions they're better than nothing."

Bravehearts does not support the Morrison government's calls for a national child sex offender register , saying it would "not keep children safe" and that the US example, known as Megan's Law, has been a "monumental failure".

"When you look at the facts it is clear that this solution simply does not work to protect children. It makes the community feel better but it does not protect our children," she said.

"If government was serious about protecting our kids and if they seriously wanted to deal with these very real dangers they would support our calls for a Royal Commission into the Family Law System and they would toughen up laws that currently release dangerous sex offenders back into our communities."

A file image of Robert Fardon. (Supplied)

Bravehearts has called for Australia to adopt legislation similar to Sarah's Law in the UK, which allows members of the public to ask police if a person in contact with their child, such as a partner, neighbour or colleague, has a criminal record for sex offences or violent offences such as domestic violence.

The state opposition wants Fardon returned to jail.

"If (Labor) didn't play politics and adopted the LNP's proposed sex offender laws, this sadistic grub would still be under lock and key," Liberal National Party leader Deb Frecklington tweeted.

"He is now free thanks to Labor."

A courtroom sketch of Robert John Fardon. (Supplied)

THE CRIMES OF ROBERT FARDON

1967 - Convicted at 18 for attempted carnal knowledge of a girl under 10. Released on a good behaviour bond.

1978 - Raped a 12-year-old girl, wounded her sister. Fled to the Northern Territory but was caught and jailed.

1988 - Broke parole by travelling to Townsville. Violently raped and assaulted a woman. Sent back to jail.

2003 - Became the first person in Queensland to be jailed indefinitely under new laws targeting repeat sex offenders.

2006 - Released on a supervision order with 32 conditions.

2007 - Breached the order by going to a school, breaching curfew and travelling to Townsville. He's briefly returned to prison before released in October.

2008 - Re-arrested over rape of a 61-year-old intellectually disabled woman.

2010 - Sentenced to 10 years' jail for the rape. The conviction was quashed on appeal a few months later but Fardon remained in jail due to other earlier breaches of a supervision order.

2011 - Government launches lengthy court battle to keep him in jail.

2013 - Released on supervision order.

2014 - Brief return to prison before court orders Fardon's release into supervised accommodation.

2018, September - Queensland government rushes through new child sex offender laws which automatically apply tough monitoring and reporting conditions to repeat offenders.

2018, November - Queensland government makes a court bid for Fardon to remain monitored by a supervision order under the Dangerous Prisoners (Sexual Offenders) Act 2003.