Since the poster did not provide a link, you cannot make one up for him and claim it to be factual. To do so is to misrepresent his post (strawman). While I agree that a link should have been provided, I'm sure it would have resulted in an ad homimen (which it did anyway; see below).
Originally Posted by MaggieD
In addition, you have committed an ad hominem, since even if the info came from a union site that alone does not mean it is incorrect.
The credit for the graphic is as follows:
Sources: Union membership rate is from Barry T. Hirsch, David A. Macpherson, and Wayne G. Vroman, "Estimates of Union Density by State," Monthly Labor Review, Vol. 124, No.7, July 2001. Middle-class share of aggregate income is from United States Census Bureau.
New Census Data Show Middle Class Continues to Struggle
The "Monthly Labor Review" is published by the U.S. Bureau of Labor Statistics. I am unsure if it, or the U.S. Census Bureau, is unionized and therefore, according to some, automatically categorized as a false source of information