AntiFirstAmendment fits their actions pretty well, I think.

Affluent Neomarxist Thugs Incessantly Fapping About
Anyone Need These Idiots Floated Away?
And Now The Insecure Fearmongering Arseholes

TheNewKKK.

Just like the original Klan, "Antifa" exists to forcibly prevent, and deter, Republicans and people of a color they hate from speaking and voting. Only the color of the targets has changed. Their party is the same.

ANTIHUM: anti human.
or, how about: AGRESUPSHIP: Aggression, Suppression, Censorship.
AW, Hell...just call it the 'Far Left'.

Against Nothing That It Finds Awesome
America's New True Imperialist Foundation Army
Arming New Trans-thinkers In Fascist Angst
All New-Think Informants For America
All Now Transforming Into Fascist America
Against Noble Trades Inciting Fictitious Assaults
Aggressors Not Taking Incentives Fighting Advancement

Annoying
Non-Thinkers
Inciting
Fascist
America

or

Annoying
Non-Thinkers
Incinerating
Freedom
Anywhere

Anti-social
National
Terrorist
Ideology
For
America

There would have to be a C in the acronym, for Communist(s). Communist socialists have always virulently despised fascist socialists (the word, socialists, points out that both delusion systems are of the left).

“ANTIFA”
A
Naive
Troop of
Identitarian
FAscists

DMSJ~Democrat Masked Socialist Jackasses
Me dino added the M because DSJ would be the rest of the Democrat Party.

Terrorists

Anonymous
Nutcases
Training
Inexperienced

FAscists