The site of numerous assaults, robberies, stabbings, and murders, Blood Alley earned its name. No part of this covered breezeway was visible from the wall or any tower. Inside was little better. A hump in the middle limited visibility from either end. Furthermore, a group of inmates could easily block observation of nefarious activity.
In the picture below, the hospital and pill line are on the right; Central Control, the BPFU, and Four/Five Wing are on the left. The auditorium, also a dangerous place in the 1970s, is in the distance.