The issue is endemic and I've seen it at companies I've worked at. Indian hiring managers have distinct obvious biases to only hire other Indians.
This is blindingly obvious if you look at the share of h1b visas that indians account for (a vast majority).
This is a touchy subject for sure, but yes, I have witnessed this firsthand at two different Fortune 10 companies. Reverse racism against caucasians was on full display and you damn well best not mention it at all. The managers saw it as building their power base using fungible assets--they kn3w, from a purely cultural standpoint, who is going to kill themselves to meet deadlines and not argue.