"I think we’re in a time when we can’t ignore the extremism from the Left," said Oren Segal, the director of the Center on Extremism, an arm of the Anti-Defamation League. Over the past few months, the ADL, which hosts regular seminars on homegrown extremism for law enforcement officials, has begun warning of the rising threat posed by far-left groups, most recently at a seminar just this past Sunday. "When we have anti-fascist counterprotests -- not that they are the same as white supremacists -- that can ratchet up the violence at these events, and it means we can see people who are violent on their own be attracted to that," Segal said. "I hate to say it, but it feels inevitable."...