And they are everywhere. Check antifa’s open presence on Facebook.
Other organizations that have been declared terrorist
Alpha 66 and Omega 7
Animal Liberation Front
Army of God
Aryan Nations
Atomwaffen Division
The Covenant, The Sword, and the Arm of the Lord
Earth Liberation Front
Jewish Defense League
Ku Klux Klan
May 19 Communist Organization
The Order
Phineas Priesthood
Symbionese Liberation Army
United Freedom Front
Weather Underground