While most Afghanis are Pashtuns, in the north of the country there are substantial numbers of Uzbeks and Tajiks. When the U.S. first became involved in Afghanistan, it was these individuals who were instrumental in defeating the mostly Pashtun Taliban.
Now the Uzbeks and Tajiks are forming militias and taking actions which may amount to ethnic cleansing against the Pashtun minority in their northern region. Talk about tribes with flags, here we go again.