sentences:  On the island, the prisoners, predominantly gangsters, were allowed to roam freely and were put to manual labour.It was envisioned that these hardened detainees could be reformed through hard work and be sent back home with an ability to seek employment afterwards.The prison-settlement was started on 18 May in 1960, when 50 detainees, sent from Changi Prison, arrived with Irish-born Prisons Superintendent Daniel Dutton, the appointed chief of the penal settlement.