Ever read The Bell Curve?
You shouldn't discriminate against individual people because a group they belong to has a typically below average IQ.
However, the group IQ is useful to know to plan policy.
Instead of violent oppression, enforced transportation etc, my policy prescription is simple: encourage the right people to have children (those with average and above average IQ, regardless of race, nationality, etc) and discourage those that are arguably the wrong people, those with low or below average IQ.
I can think of no policy a government can be involved in that would not be correctly termed an aggressive manipulation of fertility. The problem is, the government already has policies that manipulate fertility, and it is encouraging the wrong people to have children.
Now, my personal belief is that there should be no government, or an extremely limited one whose sole function is national defence. There should certainly not be a welfare state. My belief is that over time, those with greater skills and abilities will flourish in the free market, and those who have lesser abilities will not. Eventually, this will lead to a world populated in the main with those with above average and average IQ, by today's standards.
Obviously, there are objections to this - a lot of people don't like the idea of allowing people to simply die out if they are unwilling or unable to compete in a free market. It's certainly okay to think this in a free society. But I do not agree. I believe that artificially supporting those that are not able to support themselves detracts from higher living standards for all that could be achieved in only a few generations, where everyone has a good chance of being productive, and a lower chance of the type of suffering and serfdom that a welfare state inevitably, in my opinion, produces.