Operation Demetrius

Operation Demetrius was a British Army operation in The North of Ireland on 9–10 August 1971. It involved the mass arrest and internment (imprisonment without trial) of 342 people suspected of being involved with Provos and Official IRA

"The Universal Declaration of Human Rights restricts the use of internment. Article 9 states that "No one shall be subjected to arbitrary arrest, detention or exile"
http://museumforhumanrights.ca/exhibits/udhr/

Internment is illegal, but it still happens in the North Of Ireland today....
http://www.museumoffreederry.org/history-internment01.html

*penny