Behind a shield of Communist troops, East German Laborers add to the wall on the East-West Berlin border at the boundary of the French sector in the divided city Dec. 4, 1961. Sign at right marks the border. A crane is used to help workers place a concrete form on the wall near Chausseestrasse. (AP Photo) Behind a shield of Communist troops, East German Laborers add to the wall on the East-West Berlin border at the boundary of the French sector in the divided city Dec. 4, 1961. Sign at right marks the border. A crane is used to help workers place a concrete form on the wall near Chausseestrasse. (AP Photo)
