It followed the Armenian genocide of 1915. More at The Zelman Partisans.
(BTW, if any of you loyal blog readers want to buy one of the books linked at the bottom of that piece, you might come back over here and enter Amazon through my links. Amazon forbids using my links on any site but this one and TZP doesn’t have its own Amazon Associates account. So the links with the post are just plain-vanilla, nobody-gets-any-credit ones.)