Provisional Irish Republican Army

The Provisional Irish Republican Army (Provisional IRA), officially known as the Irish Republican Army (IRA; Irish: Óglaigh na hÉireann) and informally known as the Provos, was an Irish republican paramilitary force that sought to end British rule in Northern Ireland, facilitate Irish reunification and bring about an independent socialist republic, which would encompass all of Ireland. It was the most active republican paramilitary group during the Troubles.

Source: Wikipedia — Provisional Irish Republican Army (CC BY-SA 4.0)