Internment is the imprisonment or confinement of people, commonly in large groups, without trial. The term is especially used for the confinement "of enemy citizens in wartime or of terrorism suspects". Thus, while it can simply mean imprisonment, it tends to refer to preventive confinement, rather than confinement after having been convicted of some crime. Use of these terms is subject to debate and political sensitivities. 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."