As people consider how to respond to a resurgence of racist, xenophobic populism, A Mouth Is Always Muzzled tells an extraordinary story of the ways art brings hope in perilous times. Weaving disparate topics from sugar and British colonialism to attacks on free speech and Facebook activism and traveling a jagged path across the Americas, Africa, India, and Europe, Natalie Hopkinson, former culture writer for the Washington Post and The Root, argues...