<p>This work first published in German in 1911 introduced the concept of iron law of oligarchy.&nbsp;It is considered one of the classics of social sciences in particular sociology and political science.&nbsp;This work analyzes the power structures of organizations such as political parties and trade unions.&nbsp;Michels' main argument is that all organizations even those in theory most egalitarian and most committed to democracy - like socialist political parties - are in fact oligarchical and dominated by a small group of leadership.&nbsp;The book also provides a first systematic analysis of how a radical political party loses its radical goals under the dynamics of electoral participation. The origins of moderation theory can be found in this analysis.</p>