In The Purge: Anarchy there's the following dialogue between the mother and her daughter: Mother: They buy poor and sick people and they take them in their
In the Purge movie series, part of the rules of the purge are that Weapons of class 4 or lower are allowed but weapons of class 5 or higher are restricted.
The message announcing the beginning of the Purge says the following: Commencing at the siren, any and all crime, up to, and including murder, will be legal