The New York Times reports that union membership in the US fell sharply last year to the lowest level since the 1930's. Membership stands at 14.7m - a density across the economy of only 11.9% and this low average betrays wide industrial and regional disparities with private sector density now down to 6.9% and in many southern states union membership has fallen to sub-critical levels for example North Carolina at 3.2% and Georgia at 4%
http://www.nytimes.com/2011/01/22/business/22union.html?_r=2