 Most Sunni Turks follow the Hanafi school of Islamic thought, while Sunni Kurds tend to follow the Shafi'i school.The largest non-Sunni Muslim group, accounting 10-20% of Turkey's population, are the Alevis; a third of all Alevis in the country live in Istanbul.Mystic movements, like Sufism, were officially banned after the establishment of the Turkish Republic, but they still boast numerous followers.