In today's society, we see angry groups in many forms--from animal rights and climate crisis activists to citizens opposed to allowing more immigrants of certain ethnicities or religions into the country, militia groups frustrated by acts of domestic terrorism and legislation that limits gun ownership and the ability to carry weapons in public, and those outraged by what they see as police brutality or the unnecessary use of deadly force against people of color.

More than just evidence of civil unrest in society, angry groups across history and nations often ultimately affect...