Wow, I did not expect to see Anton Pannekoek appear on Hacker News frontpage. I had read a booklet from him when I was younger that was, we may say, an epistemological piece of criticism of Lenin and his followers, attempting to demonstrate how they had in the end a very "bourgeois" state of mind/epistemology and I must say rather interesting for its time. He also spent time attacking Mach, a now almost unknown physicist/philosopher that was very famous at the time. I had read an interesting article on HN about him (can't seem to find it right now). What you should know is that Anton Pannekoek is an heir of the German/Dutch anti-authoritarian Lef, people who were into workers self-organization/councils and not much into Third International "Communism".