You can try to change things from within or report the issue to a legal authority if the situation is also a legal problem, or leave and take action from outside if appropriate. You have choices, they may not be comfortable choices, but they are there.
Acting ethically doesn't consist of washing my hands of evil by removing myself from situations in which I would be complicit. It consists in preventing evil from occurring at all. Hence, whether I'm personally involved doesn't really matter.
You can try to change things from within or report the issue to a legal authority if the situation is also a legal problem, or leave and take action from outside if appropriate. You have choices, they may not be comfortable choices, but they are there.