![Many of the early concentration camps were improvised. [LCID: 61931]](https://encyclopedia.ushmm.org/images/large/3f00a0f4-4711-4e1e-912f-f40d07333e4e.jpg)
Many of the early concentration camps were improvised. Here, roll call is held for political prisoners aboard a ship used as a floating concentration camp. Ochstumsand camp, near Bremen, Germany, 1933 or 1934.
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