The process of radicalization, by which disaffected members of society are convinced to embrace violent means to pursue the goals of a terrorist ideology, has been intensely studied since the World Trade Center attacks on Sept. 11, 2001. Since then, the threat of international terrorism has become one of the main foci of U.S. national security policy. Similarly, the question of how to interrupt the radicalization process of jihadist groups has become the subject of intense research. However, terrorism against the United States is not a new threat, nor one limited to extremist Islamist groups. White supremacist groups have long presented homegrown domestic threat and, in many ways, their operations, tactics, and terrorist recruitment processes bear a striking similarity to those used by jihadist groups such as ISIS or al Qaeda. The Cipher Brief spoke with Michael German, a former undercover agent for the FBI and current Fellow at the Brennan Center for Justice, about the path to terror.