Newton’s third law of motion holds that for every action, there is an equal and opposite reaction. This principle has been weaponized by various subversive movements to change the nature of societies; they seek to create momentum, then redirect it in a way that advances their interests.
As for nation-state threats, Russia’s Internet Research Agency is allegedly involved in disinformation operations meant to create false or controlled perceptions, Iran’s Revolutionary Guard is involved in destabilization operations, and many other nations seek to manipulate others in various ways.