Of course, they always think “it will be different when we do it”, but a glance at the early Soviet history is instructive. Most of Stalin’s friends ended up dead. Show trials, purges, gulags, etc. One murderous head of the secret police followed by another murderous head of the secret police — each dying exactly like his predecessor. Stalin had no loyalty to anyone.
The street thugs of the revolution don’t live long. The guys at the top who call the shots don’t live long either. Socialism is good at killing vast numbers. Socialism isn’t good at anything else.
But they don’t teach history anymore, so the Antifa Activists have no idea how doomed they would be if they won. Which they won’t.