That “the post left are all secretly fascists” thing has brought up a lot of discussion about how the writer, an anarcho-syndicalist, slides over the transformation of several syndicalists (most notably Sorel and Mussolini) into fascism, and while this seems like a cheap point this actually ties into something that’s both a pretty strong refutation of Ross’ argument and a pretty key thing to keep in mind
If you put Sorel’s work side by side with the syndicalists it’s clear that he’s not a syndicalist and doesn’t think the same way as them, no actual cgt member would view the general strike as a myth or think about organizing in the cynical way that Sorel wrote about it. Sorel latched onto the syndicalists because he was an anti Republican and the syndicalists were the most disciplined anti Republicans at the time. Mussolinis interaction with the psi was similar.
Any movement that succeeds in opposing the status quo is gonna get the interests of people who are also opposed to the status quo, even if their opposition comes from a completely different direction. There’s no real way to remedy this, it can happen with any group especially if you’re successful. The only way to prevent those forces who have aligned with you even though their beliefs are completely opposed to your own is to define your work positively towards a thing. This is a danger to all anti-capitalist movements.