A powerful body headed by a militia leader accused of war crimes has been implicated in severe abuses against migrants in conflict-scarred Libya. Migrants say the government-funded Stability Support Authority detained them in abysmal conditions and tortured them. The accusations raise further questions over European support for Libyan authorities’ interception of migrants trying to cross the Mediterranean. The SSA is a grouping of militias that has come to rival in strength the official anti-migrant agencies like the coast guard and Navy, but it stands outside of the scrutiny of the U.N. and EU, which have been unable to access the prison where it holds captured migrants