What violence has actually sprung from leftist internet memes? You give them way too much credit.

You know that claims of a rising tide of “far-left violence” are fake news, yeah? This bullshit narrative is pumped out by the far-right and by corporate media (otherwise known as the bourgeois press) and by NGOs who get their funding from the bourgeoisie.

Also: https://en.wikipedia.org/wiki/Bad-jacketing

Bad-jacketing is a term for planting doubt on the authenticity of an individual's bona fides or identity. An example would be creating suspicion through spreading false rumors, manufacturing evidence, etc., that falsely portray someone in a community organization as an informant, or member of law enforcement, or guilty of malfeasance such as skimming organization funds.

Fed-jacketing, and Snitch-jacketing are variants of bad-jacketing that specifically aim to present the target as an informer.