Predictions Come True

I must admit this was a hard read and without further researching I wouldn't be able to understand the full context of this text. When looking deeper in the text I saw something very interesting about the statements Marx makes about the organization of proletarians.
" Thereupon, the workers begin to form combinations of (Traders, Unions) against the bourgeois; they club together in order to keep up the rates of wages; they found associations in order to make provisions before hand for these occasional revolts. Here and there, the contest breaks out into riots."
Marx infers the creation of labor unions in this statement, and goes on to discuss how labor union participation will decrease as conditions better. This can almost been seen as a prediction because less than 20 years later the first labor union is formed in 1866 and the first riot or challenge against the bourgeois was on May 4, 1866. Since then there has been a steady decline in workers participating in unions because of laws put in place like the Sherman Anti-Trust Act of 1890. So my question is how could Marx know that this was going to happen? Yes there were such things in Europe at the start of the Industrial Revolution called guilds, yet they were selective and not as persuasive against the bourgeois as the modern labor union was. My hypothesis is that Marx studied capitalism in detail for this pamphlet and made his own hypothesis of what might proletarians do and made it seem as their own efforts would not be long lasting, and should instead rely on the new idea of Communism to take care of their struggles. It just so happen that he actually was right 20 years later and it wasn't in Europe but in America that labor unions were formed.

I commented on Abbie George's Post.