Mustafa Kemal (attaturk) was not Jewish at all. Neither were the Young Turks. Antisemites of all stripes like to claim that Young Turks were the grandchildren of Jewish followers of a false Messiah who converted to Islam. But they can only cite a handful of example in a party with tens of thousands of supporters. (For some reason, many Armenian nationalists are emotionally wed to the this lie and no amount of facts matter to them.)
Well that explains why I heard this. Much stuff gets spread around as true that is not in fact true.