An objective, orderly and precise study, amazingly and admirably free of personal feeling, which is partially based on his own experiences in German concentration camps (he spent an 85 month period of internment) and on the testimony of others. This is primarily a sociological study of this ""world unto itself, a state within a state, a society without law"". Here is their purpose- segregation and elimination; its fulfillment whether by death or ""lingering liquidation"". This records their organization; their physical lay-out; their operation (admissions, questioning, etc.); the daily routine; the diet (many items of which were a ""statistical abstraction""); forced labor and other details; recreation, money, mail; sanitary conditions and health; scientific experiments (vivisection, sterilization); the reprisals against the Jews and other minorities; the means of execution; the mortality statistics; etc. etc. The first impersonal and more or less exhaustive treatment of the concentrations camps, this has a definite documentary value.