Excellent early poetry collection by Michael S. Harper reflects on race and violence in American history through two long sequences: one on John Brown and his raid on Harper's Ferry in the service of abolitionism, and the second on Dwight Johnson, a decorated black Vietnam veteran from Detroit whose life ended tragically after a tumultuous struggle with PTSD. Harper, as always, is demanding and densely allusive, but his critical narration of the national past is always insightful.