They are gaming the H1B system to get a huge number of teachers brought in from abroad (they account for over 30% of the total visas). This doesn't seem right, at a time when many American teachers are unemployed.
I've long known that the H1B visas were a scam to get low-cost workers into this country (and also, to bypass regulations about the number of visa holders from any given country). The computer industry was a major abuser of that type of visa, bringing in foreign workers while laying off American citizens.
Aside from the H1B abuse, there is a bigger issue - that of importing Turkish culture and Islamic religion into the US. These schools are operating in many states - CA, LA, and OH, just to name a few states with Gulen schools.
What is this "Gulen movement"? Read here.
around 1999 the Gulenists began to establish publicly-funded charter schools in the United States, where they already had a small number of private schools. In many (but not all) countries the Gulen schools appear on the surface to be completely secular, yet some observers have found that they covertly engage in missionary activities either after hours in school dormitories, or during other extracurricular activities.Here's information about the OH schools, called Horizon Academies.