I think JWs have convert racism rather than overt or outright racism.
They gave a perceived idea of racial harmony, which is why in the US congregations, a huge portion of the JW make-up are "minorities", esp black people. This religion focused on recruiting "minorities" especially in the 50's, 60's, and 70's where they were still fighting for basic civil rights and it promised an equalitarian society inside the constructs of their religious organization. However, I till remember being taught that the black race was a cursed race. I still remember being taught very stereotypical things about black people and blaming it on "genetics" and "the bible". I still remember black people not holding many positions of power, but again, you will see a lot of "minorities" that were encouraged by the treatment of equality, but talk to many that have left and you will hear or read something quite different.