Coercion is the threat or use of force to constrain another agent's freedom of action. Coercion and deception are two major ways to control the actions of others without their fully voluntary cooperation. The justification of coercion is often a major part of the justification of both violent and non-violent resistance.
Both the state and opposition groups use coercion to achieve political ends. Gandhi used non-violent methods of coercion, a moral force on the British. Systems of law are based on coercion.