Theresienstadt the concentration camp also referred to as theresienstadt ghetto was established by the ss during world war ii in the fortress and garrison city of terezn during world war ii it served as a nazi concentration camp staffed by german nazi guards tons of thousands of people died there some killed outright and others dying from malnutrition and disease more than 150 000 other persons including tons of thousands of children were held there for months or years before being