Basra, Iraq - The most powerful and feared institution here in southern Iraq's largest city is a shadowy force of 200 to 300 police officers known collectively as the Jameat, who dominate the local police and who are said to murder and torture at will. They answer to the leaders of Basra's sectarian militias. The militia infiltration in Basra's police force and government goes far beyond the Jameat. But it may be the most ominous example of the degree to which militias dominate Basra. The extent of Jameat's power became clear in September when British troops in armored vehicles tried...