Well, for starters, MPL wasn't anarchist-inspired, it's a coalition movement. Saying it's anarchistic would be like saying Pride is anarchistic due to the lack of a single formal leadership.

I've been in anarchist circles for years, and never, ever saw anyone mention the book "Change the World Without Taking Power". Most anarchists here are more inspired by older, classical works. I myself tend to critique them for not reading anything after 1950s.

And he must be referring to anarchists here when he talks about horizontalists, because the other political organizations in MPL are MLs, trotskyists, and maoists. What's insane is that the vast majority of the Brazilian radical left is marxist leninist and pretty much allergic to horizontalism. The reason they builds coalitions is because they are in most cases weak and small, not a lack of authority.