>> Next time on Frontline
>> They're pointing over there,
and they're saying “That's the
black flag of ISIS.”
>> Shia militias are helping
push ISIS out of Iraq, but at
what cost?
>> Are you worried that Sunnis
may turn to violence to fight
back?
>> On the ground, Frontline
correspondent, Ramita Navai,
investigates.
>> They're as scared of the
militias as they are of ISIS.
>> Battle for Iraq.
