It means that some people will have to go to the back of the bus because, for whatever reasons, their ancestors were at the front of the bus.
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Even more perverse is all the people, mainly Asian, who were at the back of the bus, have gotten to the front of the bus through hard work, and now will be pushed to the back of the bus again. If schools and tech employers reach these  racial targets, the group hit hardest will be Asians. 32 per cent of Google's employees are Asian, a group that makes up only 7 per cent of the population of the U.S.