The numbers in the New America Foundation database may well understate the toll of violence from right-wing extremists. Another FBI study reported that between January 1, 2007, and October 31, 2009, white supremacists were involved in 53 acts of violence, 40 of which were assaults directed primarily at African-Americans, seven of which were murders and the rest of which were threats, arson and intimidation. Most of these were treated as racially motivated crimes rather than political acts of violence, i.e. terrorism.
In the past year, the FBI has concluded investigations into a number of right-wing extremists, in some cases securing lengthy sentences for violent plots. In December, Kevin Harpham of Spokane, Washington, was sentenced to 32 years for planting a bomb at the site of a Martin Luther King Jr. parade. City workers found the bag containing the bomb an hour before the streets filled with parade-goers.
Right-wing extremist individuals over the past decade in the United States were as likely to use violence as a means to express their political or social beliefs as those motivated by Osama bin Laden's ideology. Even more worryingly, during the same time period, right-wing and left-wing extremist groups and individuals have been far more likely to acquire toxins and to assemble the makings of radiological weapons than al Qaeda sympathizers.