The two flags in the logo represent the communist and anarchist flags. The part about wanting to do away with the US government isn't exactly inaccurate.
Yea, except that logo is from the original German Antifa, who was concerned with doing away with a different government…
The original Antifa opposed both Nazis and moderates. They were particularly eager to oppose social democrats, which Stalin and Comintern saw as their main enemies. And it lasted little more than a year before the Nazis took over.