Gulen was an ally of Erdogan, but growing tensions in their relationship exploded in December 2013 when corruption investigations came to light.
![Erdogan [AFP/Getty]](/sites/default/files/styles/image_156x88/public/media/images/7B38078C-27E9-4E75-9A43-4ED3C5D1476D.jpg?h=d1cb525d&itok=Mv_VWypZ "Erdogan [AFP/Getty]")
![Gulen-Erdogan [AFP]](/sites/default/files/styles/image_156x88/public/media/images/6189E46A-1102-441D-8522-D02995E04665.jpg?h=d1cb525d&itok=4sRefnV9 "Gulen-Erdogan [AFP]")
![Amnesty International's Secretary-General Salil Shetty [Getty]](/sites/default/files/styles/image_156x88/public/media/images/F51D6FDE-5DA3-4AE3-828A-C58FB8C5008B.jpg?h=d1cb525d&itok=WgrJXb1d "Amnesty International's Secretary-General Salil Shetty [Getty]")
