Extending her global classroom to us, hooks made radical space possible for all the transgressive Black girls who are reading, writing, speaking and blowing up the margins — “It is time for Sapphire to testify on her own behalf, in writing, complete with footnotes.” Regina Austin, “Sapphire Bound,” 1989. Driving L.A.’s cesspit 405 freeway one afternoon in the late eighties, a voice on the radio punched out at me like a bolt from the blue. It was high-pitched…