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Same way other minorities are.
I've seen Indian caste discrimination first hand, and it's just as ugly as any klansman. It was shocking. 
Glad this is getting attention.
Reposted with full and correct title >

Wait, we have a caste system here? >

No, but if immigrants continue to discriminate against other immigrants based on the old country's caste system, that not technically against the law yet. >

That makes a lot more sense! >

In what way would someone of a lower caste be discriminated against here?