According to Antifa: The Antifascist Handbook:
Some antifa groups are more Marxist while others are more anarchist or antiauthoritarian. In the United States, most have been anarchist or antiauthoritarian since the emergence of modern antifa under the name Anti-Racist Action (ARA) in the late eighties.
The 2012 book ANTIFA has a chapter titled:
A little bit of anarchy is good for the soul
and also says:
They might call me “ANARCHIST” when I say maybe it's time to burn it down and start from scratch again
Anti-Facism in Britain says:
Supporters of 'Antifa' were from the anarchist tradition: Class War Federation, Anarchist Federation, Solidarity Federation, and No Platform.
Militant Anti-Fascism: A Hundred Years of Resistance says:
This 'loose network' evolved into Antifa, which was predominantly anarchist and took their cue from militant groups in Europe, especially those in Germany who developed the 'black bloc' approach. Antifa emerged around 2004...