By his own admittance, OP worked for one company for 6.5 years and had ONE good manager. I suspect his bad experience with managers, Indian or otherwise, had as much or more to do with his employer and the work culture.

Another indicator that this is true is that he says that being on a work visa required his colleagues to push ethical boundaries. Having worked for many years, multiple employers and many managers on a work visa myself, I can assure you that this is not true everywhere, or even most places.

Seriously, any one on a work visa who is being pressured to do something ethically repugnant should change their job. In many cases this is easier than you would imagine.