Hostage, a person held in captivity to assure that an agreement is observed or to coerce another party into taking (or not taking) some action. Countries in ancient and medieval times sometimes exchanged hostages, often persons of high rank, who could be put to death if certain agreements were broken. Invading armies often take hostages of local citizens to discourage resistance to their occupation. Terrorists sometimes seize hostages both to force concessions from governments and to gain publicity for their cause.
Masked crime fighters aren't just the stuff of Marvel and DC comics and films. These characters may not have superpowers, but they feel the call to keep citizens safe and serve their communities.
If justice is blind, then why do some court decisions spark outrage and violence? Even with an impartial jury, court cases don't always go according to plan.