An Afghan warlord backed by US special forces faces persistent allegations that he launched a two-year spate of violence involving burglary, rape and murder of civilians, desecration of mosques and mutilation of corpses. Yet, despite repeated warnings about the atrocities Commander Azizullah is alleged to have committed, he has remained on the payroll of the US military as an Afghan security guard", a select band of mercenaries. Interviews with religious leaders, tribal elders, villagers, contractors and Western and Afghan officials all pointed to a reign of terror in which they believe 31-year-old Azizullah, an ethnic Tajik, targeted Pashtun civilians while fighting the Taliban. The testimony also tallied with several independent reports documenting the allegations against Azizullah. The allegations of persistent abuses are embarrassing for Nato, and not just because of the closeness with an alleged war criminal. They also showcase the biggest drawbacks of militias, which US commander General David Petraeus wants to expand aggressively across Afghanistan. He wants to triple the size of "local defence initiatives" [militias] to 30,000 members nationwide.The consequences are too awful to contemplate: resurgent warlords, deepening ethnic tensions, widespread bloodletting and the erosion of what little authority the government in Kabul has left.