The Celtic League claims the Manx Government is breaching United Nations guidelines on the treatment of prisoners by housing adult and juvenile offenders together in prison.
Director of Information Bernard Moffatt says overcrowding at Victoria Road (pictured) has forced the move.
In the past, men and women have been forced to share wings because of an accommodation crisis.
Mr Moffatt says that was bad enough, but the present situation is even worse:
MiCard users advised to take money out before the end of the year
Cards are 'hardwired' to stop working from 1 January
'Nothing else could have been done' to save some small fish at Clypse Reservoir
Manx Utilities confirms some died during draining process
'Come back to the table,' says DOI minister
Bus drivers on the IOM have voted in favour of industrial action
Consultation seeks feedback on changes to IOM first time buyer schemes
Proposals include adjusting thresholds and reducing residency requirements
Yellow weather warning for coastal overtopping
The west most likely to be affected