When reading the recently released book on racist extremism, “A History of Hate in Ohio,” I was struck by a statistic about the growth of the neo-Nazi group Aryan Nations between the time of the Waco massacre in 1993 and the Oklahoma City bombing two years later. “In 1993 Aryan Nations was present in only three states. As Klanwatch reported in March 1995, Aryan Nations staged an alarming comeback in 1994,” write authors Michael Brooks and Bob Fitrakis. “Aided by money from the Aryan Republican Army [a domestic terrorist group that committed numerous armed robberies], the Idaho-based group...