all hell breaks loose (simple past all hell broke loose)
(idiomatic) The situation becomes chaotic or characterized by conflict or rage.
Since the pharmaceuticals don't make any money and they control the doctors. If the doctors don't make any money then all hell breaks loose. In communities like LA and New York they are using a lot of the youth for a test sight. Afrika Bambaataa
I think there are a lot of rules for women. We have a lot of expectations and a lot of rules for women. So we're expected to march in a straight line, and when we don't, all hell breaks loose. Roxane Gay
You can see these two species coexisting in a long period of stability; then on of the them drops out and all hell breaks loose. Tremendous instability. That's the Soviet Union. Chris Langton
The episode "Hook Man" preludes playing at the end of the episode, but the show doesn't create a truly outstanding music moment with the band until season 2's two-part finale, "All Hell Breaks Loose." Source: Internet