By concentration camps, I mean camps constructed to incarcerate people not for what they had done, but for who they were. Unlike criminal prison camps, or prisoner-of-war camps, concentration camps were built for a particular type of noncriminal civilian prisoner, the member of an “enemy” group, or at any rate of a category of people who, for reasons of their race or their presumed politics, were judged to be dangerous or extraneous to society.43
