A slave boy of the Masarwa tribe - subjugated by the Bamangwatos - watches cattle drink. He has no name. He gets no pay. He is merely fed. He works hard, but he knows no other life. July 05, 1950. (Photo by Bert Hardy, Picture Post).;A slave boy of the Masarwa tribe - subjugated by the Bamangwatos - watches cattle drink. He has no name. He gets no pay. He is merely fed. He works hard, but he knows no other life.