How does language speak truth to power? More specifically, how can language be used to rebel against power? The protagonists of Katherine Dunn’s three novels — 1969’s Attic, 1971’s Truck, and 1989’s Geek Love — are all positioned on the outskirts of society, sometimes by choice and sometimes not. (Dunn also wrote extensively about boxing: her 2009 book One Ring Circus collected her nonfiction about the sport, and…