Internment involved the jailing without trial of thousands of people suspected of having connections to the Irish Republican Army.

Source: https://www.pressherald.com/2023/12/31/opinion-the-uk-and-armenia-know-the-dangers-of-israels-gaza-war/

Patrick Magee, responsible for the Provisional Irish Republican Army bombing at Brighton's Grand Hotel, was released after serving 14 years of his life sentence under the Good Friday Agreement.

Source: https://www.newsandstar.co.uk/news/23843666.looking-back-memories-across-cumbria-1999/?ref=rss

Rosaleen Dalton, whose father, Sean Dalton, was killed by a booby-trapped Irish Republican Army bomb at a house in Derry in 1988, said the legal challenge gives bereaved families hope.

Source: https://halifax.citynews.ca/2023/12/20/ireland-to-launch-a-legal-challenge-against-the-uk-government-over-troubles-amnesty-bill/

The Irish Republican Army did this a lot, IIRC.

Source: https://www.fark.com/comments/12822434?utm_source=feed&utm_medium=comments&utm_campaign=fark