The question defines terrorism as a method of political action involving violence against civilians and infrastructure to influence behavior. This tactic is often used by groups to achieve political aims and create fear. Terrorism has wide-ranging effects socially, economically, and politically. ;
The term for 'a method of political action that uses violence against civilians and against infrastructure' is terrorism. This tactic targets non-combatants to instill fear and is driven by political motivations. Examples include high-profile attacks by groups like Al-Qaeda and ISIS, which have far-reaching social and political impacts.
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