It's the English translation of the 3-word slogan of the French Revolution
... At the time of 
the French Revolution, "Liberty, Equality, Fraternity" was one of the many ... (in 
December 1790) that the words "The French People" and "Liberty, Equality,... [DOC] [TLE] 20 French Phrases You Should Be Using | Mental Floss [PAR] Dec 5, 2014 ... More recently it's come to be used figuratively in English to describe a disorderly 
or chaotic mess.