Peacekeepers

The Peacekeepers are a group of soldiers that serve as the Capitol's private security force. Though they are tasked with maintaining "order" and ensuring that everyone obeys the rules, they are also tasked with brutally silencing anyone who tries to speak out against the regime. Furthermore, the Capitol also regularly employs them as their own private army, using them to crush out any kind of resistance to the Capitol's rule.

Functions of the Peacekeepers
Peacekeepers are assigned the task of maintaining order and thus go to extreme lengths to punish those who would disobey, with said punishments typically involve whipping the offender in public. In the larger districts the Peacekeepers are particularly strict due to needing to manage the larger sized population, but in other more poor districts like District 12, they show more leniency due to the fact that illegal hunting gets them food as well as the district as a whole.

District 11 Peacekeepers are particularly ruthless and unstable, having been known to execute citizens for minor offenses (such as when an elderly man saluted Katniss Everdeen, which they saw as a symbol of defiance) and also believing that forty lashes for illegal hunting is not a sufficient punishment.

Trivia

 * Though comparisons have been made to the Roman military (likely also having to do with the Hunger Games similarity to Gladiator games) the Peacekeepers also bear a strong resemblance to the Stormtroopers from Star Wars, as both are fascist soldiers dressed exclusively in white with full-face covering helmets who are used by the regime they serve to silence any and all opposition.