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:
Officers and partner agencies praised following immigration fraud conviction
Fraudster jailed following Operation Helios
Work to improve mooring at Ferry Terminal in Liverpool scheduled for next week
DOI asks Steam Packet to reschedule sailings due to crane unavailability
Manx Care reports major drop in dental waiting lists
Health body says renegotiated contracts have cut delays by more than 75 percent
Police 'disappointed' to find more than half of vehicles with defects in latest winter checks
25 of the 47 drivers stopped in Ballasalla had issues with their vehicles