The Employee Free Choice Act in the U.S. would make it easier for workers to unionize. There are numerous documented instances of management interference in unionization drives and harassment of union supporters. I don't support a lot of the labor movement's positions (e.g. the United Auto Workers' opposition to improved fuel standards), but workers have the fundamental human rights of freedom of association and freedom to join trade unions to protect their interests.
Businessweek features differing views on the EFCA from a business leader and one of the sponsors of the Act. It makes for good reading.