The Troubles: total number of people interned 1971-1975, by religious background

During the Troubles, the British government introduced a policy of internment in Northern Ireland, whereby authorities had the power to arrest and detain without trial individuals believed to be associated with paramilitary organizations. Between August 9. 1971 and December 5. 1975, almost 2,000 people were interned by the police and British Army. Around 95 percent of these were from a Catholic background, while the first Protestant internees were not arrested until 1973.

Internment was introduced in an attempt to weaken the IRA and other nationalist paramilitary groups, however it had the opposite effect. Mismanagement and outdated information saw hundreds of unaffiliated people interned, some of those interned suffered police brutality and were coerced into confessions, and several anti-internment protests turned into some of the bloodiest days of the Troubles. These factors combined to bolster support for Catholic paramilitaries, who gradually transitioned from using defensive to offensive tactics in the early 1970s, and these groups would go on to be responsible for the largest number of combined deaths during the Troubles.