A few decades ago during the Cold War, there were several large scale anti-caste movements, and this caused a lot of the moneyed upper caste (note that many of the upper caste are poor) to flee to the US where money often open doors. The immigration to the UK and the other English speaking countries tended to be more varied and more middle class based on skills (doctors, engineers, etc...).
It's widely known within India that a notable portion of the upper caste are based in the US, but in India the IT industry is one of the most caste-blind industries in India, along with how the majority of the IT industry is based in South India where casteism is traditionally less.
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