My money is on Antifag.
Seems like there's something criminal in telling kids to bring guns to school.
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.
https://www.politico.com/story/2017/09/01/antifa-charlottesville-violence-fbi-242235
Antifa: US security agencies label group 'domestic terrorists'
Department of Homeland Security has reportedly been warning about growing threat of violence between left-wing anarchists and right-wing nationalists since early 2016 (SEPT 2017)
https://www.independent.co.uk/news/world/americas/antifa-domestic-terrorists-us-security-agencies-homeland-security-fbi-a7927881.html
FBI probe of 'Antifa ideology' underway, Wray tells House panel (Dec 1?)
https://www.foxnews.com/politics/fbi-probe-of-antifa-ideology-underway-wray-tells-house-panel