Q & A on union rights in the US

The attack on the collective bargaining rights of public sector workers in Wisconsin has triggered a debate in the US media on union rights. Here Steven Greenhouse of the New York Times answers question from readers on the evolution and decline of trade unionism in the World's largest economy, where private sector union membership is perilously low at 7% of the workforce: http://cityroom.blogs.nytimes.com/2011/03/24/answers-about-labor-laws-and-unions/