IN 1990, Japan allowed entry of Brazilians of Japanese descent up to the 3rd generation, and many Brazilians went to Japan to work as cheap labor since Brazil's economic situation was pretty bad.

Like all "migrant workers", they're considered low class and are treated that way, similar to how Turkish people are treated in Germany.

Second/third generation children of Japanese immigrants to Brazil were historically given special visa access.

I assume the OP is actually referring to these returned second generation Japanese.