Disenfranchising groups of people based on intelligence?

Disenfranchisement has sort of a negative connotation around it, I feel as if it could help America efficiently allocate labor and people to their most proper places in society. So what thinks you, common peasant of Yahoo about this? Do you think that if you could establish A. that iq is quantifiable and that it reflects mental ability and that B. a certain group of people on average have a lower iq than the aggregate mean, below the threshold of even understanding basic economic, political concepts etc., that it would be in the best interest of society to ban that group from participation in voting, government, having certain civil rights etc.? I think you understand where I'm going with this, but also bear in mind that similar legislation already exists i.e. An age requirement for voting, consumption of alcohol, holding certain offices, which were instituted with the understanding that people on average under a certain age 18, 21, etc. don't have reasoning ability yet to partake in voting, drinking etc.
 
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