Abdu'l-Baha's views on the mass execution of the Banu Qurayza Jews in Medina in 627 A.D. [article in Persian].
Article submitted to Iran Nameh in 2014 March; I don't know if it was published. Title translation provided by Bahai Nafeza.
The Execution of the Jews of Banu Quraida and the Conquest of Persia:
The Dilemma of Early Islam
published in Iran Nameh
originally published as "اعدام وقتل عام یهودیان بنو قريظه وفتح ايران: دومسألهٴ بغرنج دوران صدر اسلام ؟ ".