Proper noun
English Wikipedia has an article on:Royal Ulster ConstabularyWikipedia
Royal Ulster Constabulary
(historical) Northern Ireland's police force from 1922 to 2001.
Since its formation, the CIRA has waged a campaign in Northern Ireland against the British Army and the Police Service of Northern Ireland (PSNI), formerly the Royal Ulster Constabulary (RUC). Source: Internet
The state security forces – the British Army and the police (the Royal Ulster Constabulary ) – were also involved in the violence. Source: Internet