According to the FBI:
Domestic terrorism is the unlawful use, or threatened use, of force or violence by a group or individual based and operating entirely within the United States or Puerto Rico without foreign direction committed against persons or property to intimidate or coerce a government, the civilian population, or any segment thereof in furtherance of political or social objectives. (source)
In Michigan, union protesters physically assaulted Steven Crowder of Fox News, then destroyed a tent belonging to Americans for Prosperity (video below).
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