This set of essays is interesting mainly because the author is good at presenting clear arguments. Their subject matter unfortunately reflects the fact that they were written in the 1960's: there's too much marxism and the theory of democracy only makes a small cameo appearance as the oligarchic theory of political parties. This serves as a good reminder of the insights that have been made in political theory in the past 60 years. The analyses presented in this book are not necessarily outdated, but they are uninteresting. I wish the author would have rewritten the whole thing in the 2000s.