From a comment on this NYT article, which came to me via Instapundit via Ann Althouse:
"It is facile, lazy, and simply wrong to blame the anti-union efforts of Reagan, Walker, the Kochs, Whole Foods, Walmart and the like. If you say it is the anti-union policies of the past thirty five years, then you are simply ignoring the fact that when American unions formed in the 19th century and struggled to build in the first third of the 20th century, the anti-union sentiment of the corporations and most politicians was much stronger than today, and the lot of the average worker was harder. Lazy people blame others. If those who originally fought to create our unions had such an attitude, unions would never have been established in the first place. Part of the problem is that the Left failed to criticize unions as their leadership often evolved to having more in common with the bosses than with their own members. As the Left moved away from worker issues in the Sixties to Civil Rights, the anti-war movement, feminism, and cultural issues, blue collar workers became alienated from those who were now largely content to support labor by merely singing Woody Guthrie and Weavers songs. The Left largely came to look down their noses at workers because of attitudes regarding culture and the war, only honoring workers when their issues were tied to something else, such as the largely Mexican-American United Farmworkers Union or access to jobs for women."People will voluntarily join unions when they believe that the union provides them with something of value.