The head of the Gulen Movement, Fethullah Gulen may have left Turkey for America after he was charged for trying to undermine Turkey's secular government. Some of his followers also call this movement "Hizmet", which means service. Critics point to an alleged 1999 video where he told his followers, according to a BBC article today:
"You must move within the arteries of the system, without anyone noticing your existence, until you reach all the power centres. You must wait until such time as you have got all the state power, until you have brought to your side all the power of the constitutional institution in Turkey."
Gulen was later cleared in abstensia of the charges. A media group in Turkey run by the movement includes newspapers, TV and radio stations. According to the BBC article, some Turkish journalists claim you can't criticize this movement and last year a police chief who wrote a book about the movement was arrested as were two investigative journalists. All three remain in jail.
Fethullah Gulen lives in Pennsylvania. Concerns about a number of charter schools allegedly linked to his movement in the U.S., including possibly four in Oklahoma, has received media attention recently.