FBI, Homeland Security warn of more ‘antifa’ attacks http://www.politico.com/story/2017/09/01/antifa-charlottesville-violence-fbi-242235 Federal authorities have been warning state and local officials since early 2016 that leftist extremists known as “antifa” had become increasingly confrontational and dangerous, so much so that the Department of Homeland Security formally classified their activities as “domestic terrorist violence,” according to interviews and confidential law enforcement documents obtained by POLITICO. (More at above url)