Labor unions in the US started as early as the 19th century with Knights of Labor who became a major force in the 1880s and after their collapse American Federation of Labor formed a coalition of lots of national unions. After that many unions come and was replaced by others and several unions competed to being the best. Today however they are mostly divided into two organizations namely Change to Win Federation and American Federation of Labor-Congress of Industrial Organizations.
They both advocate legislation and policies which are favourable to US and Canada workers and also favour the politics of the Democratic party. The AFL-CIO specifically concerns themselves with the global trade issues. Both the unions are a large issue in the Economic Crises in 2008 as the three biggest automakers wanting $50 billion loans. The US automakers suffered more because of the union’s costly labor agreements.
National Labor Relations who is an independent federal agency, oversees the National Labor Relations Act who in turn regulate the private sector union very tightly. The Public sector unions get regulated by state and federal laws. Workers need recognition from employers or get a majority of workers to vote for them to have a union in order to join traditional labour union. Then the new union gets certified by government. Solidarity unionism is another form of unionism as well as the Industrial Workers of the World. Industrial Workers of the World, however are not always conforming to traditional organizational methods.