So this is really a FOR BEGINNERS, it has some basic info on anarchism overall and a few of the most known "leaders" of the movement. It would have been a bit better if it didn't mix in stuff, like if it had a chapter for these people and sort of made their biographies in chronological order, though I understand these people somehow ended up meeting and affecting each other's thoughts and ideas so it must be difficult to organice all of it.
Overall a nice book for someone who may not have any idea of where to start or what line of thought they may feel most compelled to follow (as in with so many great writers and philosophers they may not know who is the closest to their thoughts or who would they immediately feel like is on a much further away stance on this subjects). As an anarcho-communist who has already read other stuff, this book is useful to organise my mind into what each of them had thought about social classes, along capitalism, the state and politics.