Which Sunni-Islamic fundamentalist organization has a social service wing named Dawah and had its politburo chief step down at the end of his term in 2017?
Khaled Mashal:  He stepped down as Hamas' politburo chief at the end of his term limit in 2017. Hamas:  It has a social service wing, Dawah, and a military wing, the Izz ad-Din al-Qassam Brigades.
Hamas