(CNN)Was a plan to overthrow Turkey's government really hatched behind a gated compound in a small, leafy Pennsylvania town, or is that merely a smoke screen? In the throes of a military coup attempt, Turkey's embattled president, Recep Tayyip Erdogan, pointed the finger of blame squarely at his bitter rival: Fethullah Gulen. At the center of this rivalry, a fundamental division in Turkish society between secularists -- some within the country's top military brass -- and Islamists, including Erdogan's AKP party. It's this division that's destabilizing one of America's most important allies in the Middle East. And at the center of all this is Gulen, a reclusive cleric who leads a popular...
