"The share of Americans in unions has plummeted from 35 percent in the mid-1950s to about 10 percent today. The rate is even lower — about 6.2 percent — for private-sector workers. The decline has happened largely because employers have become more aggressive about keeping out unions and government policy has made it easier for them to do so. The decline in unionization is one reason that the share of total national income flowing to corporate profits has risen — and the share going to worker pay has declined. The trend is starker in the U.S. than in Europe."