Lenin predicted the same damn thing about how horizontal movements are doomed to fail without a principled Vanguard Party and disciplined revolutionary militant movement. And he has been historically proven right every time.

An example in modern history: The dismantling of the Occupy Walstreet movement by the bourgeois state apparatus i.e. the state police, FBI, DHS, NSA etc.

Sources:

1. What is to be done?
2. One stepforward, two steps back

Edit: Forgot to ask. Is it a good enough of a book to add to my 'to be read' list?