From Homeland Security Today, this article: Jewish Community in America ‘Afraid in a Way We Have Never Been Before,’ Orthodox Union Tells Congress. Of special interest is what the Police Dept. in NYC is doing:

Miller said the NYPD’s new Racially and Ethnically Motivated Extremism unit — a 25-strong group of officers and analysts — is “specifically dedicated to investigating not just hate crimes, but more specifically the actions in the growth among violent hate groups as they spun across the country and across the Internet.”

“The idea is to identify groups with a propensity to violence and those individuals who may carry it out and to stop those incidents before they happen,” he said. “To do this, we go by the same rulebook and the same tactics and the same techniques we used to thwart attacks by ISIS and al-Qaeda and the lone wolves they inspire. We’ve already opened dozens of investigations within REME in the short time since it was formed.”