Posted on Thu, Apr. 05, 2007 Powerful, unchecked clan surges in Gaza By Dion Nissenbaum and Ahmed Abu HamdanMcClatchy Newspapers(MCT)GAZA CITY, Gaza Strip - Along the southern stretches of Gaza City, in a stronghold surrounded by concrete barriers and patrolled by armed guards, a powerful clan has evolved into a force that the Palestinian Authority is afraid to confront.Palestinian officials suspect Mumtaz Dagmoush and his extended family of 15,000 of involvement in every major recent crisis in Gaza, from the capture of an Israeli soldier last summer to the unresolved kidnapping of a BBC correspondent last month.Israel's security establishment...