Al-Gama'a al-Islamiyya
Some insurgent groups -- Al-Gama'a al-Islamiyya of Egypt, and later GIA, the Taliban, and ISIL) -- are thought to have gone even further, applying takfir and its capital punishment against not only to Sunni government authorities and Shia Muslims, but to ordinary Sunni civilians who disagree with/disobeyed insurgent policies such as reinstituting slavery.