Someone else said they were here legally, using student visas.
I have already forgotten which way it was.
Most were here illegally. All had red flags on their visa applications and should never have been admitted in the first place. Citizens had reported many of them to the FBI more than once because of suspicious behavior. Sad so many people go on this forum and lie. You can check all this for yourself, it is easy, there is this thing called Google, use it!