The phrase "mass chaos" means a situation where there is a lot of confusion, disorder, and lack of control among a large group of people or things. Full definition
History tells us of mass chaos caused by a massive downfall in agricultural yields occurring numerous time. (realclimate.org)
The mere 2 inches was enough to shut the city down and create mass chaos! (peachesinapod.com)
Kirsten Gillibrand to fill the vacancy left by Clinton when President Obama tapped her to be Secretary of State, noting that to do so would likely have caused mass chaos in the state. (nystateofpolitics.com)