preventive detention
From Longman Dictionary of Contemporary EnglishRelated topics: Jail & punishmentpreventive detentionpreˌventive deˈtention noun [uncountable] British English lawSCJ a system in which people who are guilty of many crimes are kept in prison for a long timeExamples from the Corpuspreventive detention• Her order of preventive detention caused consternation among lawyers over a possible breach of civil liberties.• Apart from the clearly implied step toward preventive detention, it was almost impossible not to detect an underlying racism.