Coercion
Overview: The purpose of coercion is to substitute one's aims with weaker ones that the aggressor wants the victim to have. For this reason, many social philosophers have considered coercion as the polar opposite to freedom.
Various forms of coercion are distinguished: first on the basis of the kind of injury threatened, second according to its aims and scope, and finally according to its effects, from which its legal, social, and ethical implications mostly depend.

Physical: Physical coercion is the most commonly considered form of coercion, where the content of the conditional threat is the use of force against a victim, their relatives or property. An often used example is "putting a gun to someone's head" (at gunpoint) or putting a "knife under the throat" (at knifepoint or cut-throat) to compel action under the threat that non-compliance may result in the attacker harming or even killing the victim. These are so common that they are also used as metaphors for other forms of coercion.
Armed forces in many countries use firing squads to maintain discipline and intimidate the masses, or opposition, into submission or silent compliance. However, there also are nonphysical forms of coercion, where the threatened injury does not immediately imply the use of force. Byman and Waxman (2000) define coercion as "the use of threatened force, including the limited use of actual force to back up the threat, to induce an adversary to behave differently than it otherwise would." Coercion does not in many cases amount to destruction of property or life since compliance is the goal.

Pain compliance: 

Psychological: In psychological coercion, the threatened injury regards the victim's relationships with other people. The most obvious example is blackmail, where the threat consists of the dissemination of damaging information. However, many other types are possible e.g. "emotional blackmail", which typically involves threats of rejection from or disapproval by a peer-group, or creating feelings of guilt/obligation via a display of anger or hurt by someone whom the victim loves or respects.

See also: 

Notes: 

References: Anderson, Scott A. (n.d.). "Towards a Better Theory of Coercion, and a Use for It" (PDF). The University of Chicago. Archived from the original (PDF) on 8 March 2005. Retrieved 12 October 2018.
Lifton, Robert J. (1961) Thought Reform and the Psychology of Totalism, Penguin Books. ISBN 9781614276753

External links: 
 Media related to Coercion at Wikimedia Commons
Anderson, Scott. "Coercion". In Zalta, Edward N. (ed.). Stanford Encyclopedia of Philosophy..
Carter, Barry E. Economic Coercion, Max Planck Encyclopedia of Public International Law (subscription required)