A Brother's Vengeance: The Preacher Who Could Topple Erdogan; The greatest threat yet to Turkish Prime Minister Erdogan comes from a former ally. Muslim preacher Fethullah Gülen and his influential followers seem determined to accomplish what the recent protest movement could not: overthrowing the current regime

Turgut Keles loved his premier. He maintained his support of Turkish Prime Minister Recep Tayyip Erdogan through early summer, when demonstrators in Istanbul were protesting the redevelopment of Gezi Park. When Erdogan held a rally for tens of thousands of supporters, Keles was in the first row.

But just half a year later, everything has changed. "Erdogan must go," the former fan now says, adding that the prime minister has "betrayed" millions of Turks. Keles long voted in favor of Erdogan's conservative Justice and Development Party (AKP). But his support of the party is exceeded by his admiration of Muslim preacher Fethullah Gülen, the leader of a powerful civic movement that is now at odds with Erdogan.

Keles attended a school founded by Gülen followers, and later studied at one of the movement's universities. The organization helped him find a job, he says. Today, Keles works for a construction company in Istanbul and remains a devoted follower. "Anyone who insults Gülen, insults me," he says.

For a long time, Gülen and Erdogan were allies. This fall, however, the prime minister announced that tutoring centers run by the Gülen movement would be shut down. Erdogan has accused the preacher's supporters of creating a "state within a state," and since then the two sides have been locked in a bitter power struggle. The conflict appears to confirm what many once dismissed as a conspiracy theory -- that in many cases the Gülen movement controls the police and justice system.

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