Inside the camps the prisoners reflected his obsession with order and his compulsion to classify: they formed a living card index, displaying their category in coloured patches sewn on the left breast of their jacket and the right side of their trousers – red triangles for ‘politicals’, green for criminals, pink for homosexuals, black for the vagrants, the work-shy and the uncooperative who were known as ‘anti-socials’, purple for Jehovah’s Witnesses, whose beliefs prohibited them from bearing arms, yellow for Jews.
