What is the fine-grained topic of the following text: Some 50,000 people have been arrested since a failed putsch in July last year and about 150,000 have been dismissed or suspended from their posts, including soldiers, police, teachers and public servants, over alleged links with the movement of U.S-based cleric Fethullah Gulen. Only return the topic.
Post-coup arrests and dismissals in Turkey related to Fethullah Gulen's movement