This is a fair question! Opposition to ability grouping is a fringe idea opposed by the great majority of parents. So which obscure, fringe organizations are pushing it?
Let's ask the National Council of Teachers of English what they think:
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Analytic Valley Girl Chris
@ChrisExpTheNews
Replying to @hkozachkov @tracewoodgrains and @turing_hamster
Give me an example of where anti tracking is being actually pushed. Not just some crank writing an op ed, but in a way that might actually effect policy change in a district. Who's asking for it?