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Chart of prisoner markings
Dachau concentration camp, German Empire, ca. 1938-1942
KZ-Gedenkstätte Dachau, Dachau, Germany
Bundesarchiv, Bild 146-1993-051-07 / CC-BY-S.A 3.0, Koblenz, Germany

The Nazi regime brutally repressed its enemies and also ensured that those who were seen as security risks because of their political opposition, civil disobedience or resistance ended up in concentration camps.