Authorities believe a body found buried last week in a San Francisco park is that of a man who had ties to Your Black Muslim Bakery in Oakland and who vanished two years ago under suspicious circumstances, The Chronicle has learned. The man, thought to be Omar Sharif Allah, disappeared in October 2007 as the black self-empowerment group was in the final stages of its unraveling. Its leader, Yusuf Bey IV, son of the man who founded the bakery in 1968, had been jailed two months earlier on charges of kidnapping two women and torturing one of them. Bey IV...