Hannah, there seems to be not much relation between your definition and and the reality of the "camps". I never heard of the Dictionary of World War II and now I must wonder who the publisher is. Here is the Wikipedia definition: "Kapo was a term used for certain prisoners who worked inside the Nazi concentration camps during World War II in various lower administrative positions. The German word may mean "foreman" and "non-commissioned officer", and is derived from French for "Corporal" (fr:Caporal) or the Italian word capo. Kapos received more privileges than normal prisoners, towards whom they were often brutal." And here is a similar definition from a glossary library.thinkquest.org/12663/glossary.html : "Kapo Short for Kameraden Polizei, these were prisoners forced to supervise their comrades and act violently less they themselves be killed."
Clashes between IDF and protesters in Bethlehem and East Jerusalem (Reuters)
from the article: Spoiling for a fight