I am currently an international PhD student in a private university in the US ranked among the top 20. However, my department ranking is pretty bad. I mention this because the faculty bend and break the rules as they see fit.
PhD students are required to work up to 20 hours a week as part of the agreement with the department regarding their admission and financial support. Although F1 student visa rules only allow us to work for up to 20 hours a week, the Graduate Director and two faculty forced me to work for over 40 hours a week without extra pay, by threatening to remove my financial support, make fictitious complaints about me to the Graduate Director, telling lies about me to the rest of the faculty and the department, and then they also threatened to take steps to get my visa cancelled. The extra work included some of their responsibilities for the courses they were teaching and some of their contract work for third-parties which they were getting paid for (but I was not).
They had done the same to an earlier PhD student who quit the PhD program because of this. The Graduate Director promptly switched me in place of that earlier student, so that the faculty could get their extra work done from me.
Most of their threats were verbal, but I have some proof via emails where they lied about my work to some faculty and staff, asked me to repay my stipend back (in spite of their being on the Council of Graduate Schools), and threatened to make some complaints about me to the Graduate Director about why they felt it was inappropriate for me to continue as a student in the department. I have some emails where they asked me to do some unethical work as part of their contract work, and I did not do it. I also have my emails informing my advisor and the Graduate Director about the extra work, and my email complaint to the chair of the department about the threats they made.
My complaint to the chair of the department was prompted when the faculty threatened to take steps to cancel my visa. After my complaint to the chair, the miscreants did not attempt to refute any of my accusations, but instead the Graduate Director and faculty are retaliating by pressuring my advisor into neglecting me as one of his students, and rejecting any research work that I have done so far. They have not kicked me out as yet since my GPA is over 3.9, but the Graduate Director has warned me that my financial support will be cut if I do not make any progress in research in the next academic year.
Please let me know if this is a common scenario in US universities, and suggest what I could do about this.