the 1920's and 30's were the height of Anarcho-syndicalism's popularity, culminating in an Anarcho-syndicalist revolution in the city of Catalonia during the Spanish Civil War.
All of the things in the comic are popular trends from the 1920's.
I don't think he adopted a particular flavor, he seemed to be into standard anarchism, far as I can tell. Or at least, what he gathered from the anarchists he spoke to.