What do you mean? Do you not consider Bobby Fischer to be intelligent? Do you think he was a "smart" man?
I'm saying the complete opposite -- Bobby Fischer was a genius.
His political beliefs are totally irrelevant to that point. Political beliefs are partly a result of genetic tendencies and environment, of which neither have to be directly a result of intelligence. The raw capacity to deal with complex meaning and patterns (high intelligence) can exist in diametrically opposed worldviews.
You could say that Bobby Fischer used his genius intellect poorly to formulate his political views. But you can't say he's not a genius (just look at his chess success of which most was achieved independently).