[akchin]

This is a tough one, but I would look for signals that you would look for even with non-Indians. e.g. is someone being excluded from team building activities, OR after work get togethers, OR are someone's ideas being dismissed without any particular reason.

Now, with specifics to Indians, - if you hear someone mention they are Brahmin for no real reason, or in relationship to being really good at something, make a mental note that they may be at high risk of discriminating others - if you hear folks pejoratively putting down someone because of where they are from or how they grew up - a small village