This photo was taken by an SS photographer. It is part of an album discovered after liberation by a female prisoner. Most people create family albums containing photos of their children, wives, husbands, mementos of places visited... Evidently this SS photographer was proud of the work he and his comrades were doing. The people in the photo had only just been brought from the trains where they had been crammed in cattle cars with no food, water or sanitation. Look closely at them, these were the people the Nazis considered dangerous. Not long after this photo was taken they were gassed, and their bodies burned.