So it began in the 50's after the India trip and is with us until today. I posit that Burnham's succeeding anti indo racism, while inexcusable, was at least in part shaped by apan jhaat practiced by Indians first.
I think there was also a cultural divide. Many of the Indians who left with Burnham were more "westernized", and quite likely Christians. They probably despised this rural, heavily Hindu group who followed Jagan, and might have felt more cultural affinity with Burnham.
We can even see this today with the first wave of Indians who joined the AFC in 2006. A more urban and educated crowd.
It is noteworthy in both Trinidad and Guyana that a disproportionate % of Indians embedded within the PNM and the PNC tend to be Muslims or Christians. Given common Judeo origins I think that Christians understand Muslims more than they do Hindus.