#ThePurge  The films present a near-future dystopian America which celebrates an annual national holiday known as the Purge, in which all crimes, including murder, are legal for a 12-hour period. 

  #Purge is an American media franchise centered on a series of dystopian action horror films distributed by Universal Pictures and produced by Blumhouse Productions and Platinum Dunes, mainly created by James DeMonaco.

In 2014, following an economic collapse and rising social unrest, a political organization named The New Founding Fathers of America (NFFA) is formed and is voted into office. The organization establishes a new totalitarian government and a police state. In 2016, the NFFA devises a plan to help stabilize American society and later in 2017, the 28th Amendment to the U.S Constitution is ratified. weki

This amendment establishes a 12-hour event known as "The Purge" which would take place from 7 PM on March 21 to 7 AM on March 22 wherein all crime becomes legal. Before the Purge begins, the Emergency Broadcast System is activated with rules and a prayer saying "Blessed be our New Founding Fathers and America, a nation reborn" before ending with "May God be with you all". The rules for the annual Purge are as follows: Sirens blare throughout the land to signal the start and end of The Purge. All police, fire, and medical emergency services remain unavailable or suspended for the full 12-hour Purge. Government officials of ranking 10+ are granted immunity (revoked in Election Year to legalize the murder of a political opponent). "Classes 1-4" weaponry are permitted Below is how the Emergency Broadcast System announces the Purge' commencement in the first two films: 

This is not a test. This is your emergency broadcast system announcing the commencement of the Annual Purge sanctioned by the U.S. Government. Weapons of class 4 and lower have been authorized for use during the Purge. All other weapons are restricted. Government officials of ranking 10 have been granted immunity from the Purge and shall not be harmed. Commencing at the siren, any and all crime, including murder, will be legal for 12 continuous hours. Police, fire, and emergency medical services will be unavailable until tomorrow morning at 7 a.m., when The Purge concludes. Blessed be our New Founding Fathers and America, a nation reborn. May God be with you all. — Purge Emergency Broadcast System  weki