On July 4, 1914, a detonation destroyed a Harlem tenement in the largest explosion New York City had ever seen. Among the dead were three bomb-makers --- incited by anarchist Alexander Berkman --- who were preparing to dynamite the estate of John D. Rockefeller Jr., widely vilified for a massacre of his company’s striking workers that spring. MORE POWERFUL THAN DYNAMITE charts how anarchist anger, progressive idealism and plutocratic influence converged in that July explosion.