Terrorism, Noun

merriam-webster.com: Definition of terrorism : the use of violent acts to frighten the people in an area as a way of trying to achieve a political goal

FBI: Domestic terrorism: Violent, criminal acts committed by individuals and/or groups to further ideological goals stemming from domestic influences, such as those of a political, religious, social, racial, or environmental nature.

United Nations (Wikipedia) :Criminal acts intended or calculated to provoke a state of terror in the general public, a group of persons or particular persons for political purposes are in any circumstance unjustifiable, whatever the considerations of a political, philosophical, ideological, racial, ethnic, religious or any other nature that may be invoked to justify them.

legaldictionary.net: Definition of Terrorism. Noun. The use of violence, threats, or intimidation to incite fear, or to coerce action, for political purposes. The use of violence as a means of achieving a goal.