The Terrorist Threat Confronting the United States

A 2002 Counterterrorism Testimony, following the Terrorist attack of Sept. 11th 2001... With regards to Domestic Terrorism and the link of ISIS recruiting (International Terrorism), what group would be more susceptible- the left or right wing?
"Domestic Terrorism

Domestic right-wing terrorist groups often adhere to the principles of racial supremacy and embrace antigovernment, antiregulatory beliefs. Generally, extremist right-wing groups engage in activity that is protected by constitutional guarantees of free speech and assembly. Law enforcement becomes involved when the volatile talk of these groups transgresses into unlawful action.

On the national level, formal right-wing hate groups, such as the National Alliance, the World Church of the Creator (WCOTC) and the Aryan Nations, represent a continuing terrorist threat. Although efforts have been made by some extremist groups to reduce openly racist rhetoric in order to appeal to a broader segment of the population and to focus increased attention on antigovernment sentiment, racism-based hatred remains an integral component of these groups’ core orientations.

Right-wing groups continue to represent a serious terrorist threat. Two of the seven planned acts of terrorism prevented in 1999 were potentially large-scale, high-casualty attacks being planned by organized right-wing extremist groups.

The second category of domestic terrorists, left-wing groups, generally profess a revolutionary socialist doctrine and view themselves as protectors of the people against the “dehumanizing effects” of capitalism and imperialism. They aim to bring about change in the United States and believe that this change can be realized through revolution rather than through the established political process. From the 1960s to the 1980s, leftist-oriented extremist groups posed the most serious domestic terrorist threat to the United States. In the 1980s, however, the fortunes of the leftist movement changed dramatically as law enforcement dismantled the infrastructure of many of these groups, and the fall of communism in Eastern Europe deprived the movement of its ideological foundation and patronage."