Currently you are able to watch "The Purge: Anarchy" streaming on Amazon Prime Video. It is also possible to buy "The Purge: Anarchy" on Apple TV as download or rent it on Neon TV, Apple TV online.
One night per year, the government sanctions a 12-hour period in which citizens can commit any crime they wish -- including murder -- without fear of punishment or imprisonment. Leo, a sergeant who lost his son, plans a vigilante mission of revenge during the mayhem. However, instead of a death-dealing avenger, he becomes the unexpected protector of four innocent strangers who desperately need his help if they are to survive the night.