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This graph is pretty much all you need to know
Sources: Union membership rate is from Barry T. Hirsch, David A. Macpherson, and Wayne G. Vroman, "Estimates of Union Density by State," Middle class share of aggregate national income includes the second, third and forth income quintiles and is from the United States Census Bureau's Current Population Survey (Shares of Aggregate Household Income by Quintile)
Source: Analysis by Colin Gordon of Historical Statistics of the United States, unionstats.com, Picketty and Saez 2003 and The World Top Incomes Database. Colin Gordon is Professor of History at the University of Iowa and a Senior Research Consultant at the Iowa Policy Project.