<P> To join a traditional labor union, workers must either be given voluntary recognition from their employer or have a majority of workers in a bargaining unit vote for union representation . In either case, the government must then certify the newly formed union . Other forms of unionism include minority unionism, solidarity unionism, and the practices of organizations such as the Industrial Workers of the World, which do not always follow traditional organizational models . </P> <P> Public sector worker unions are governed by labor laws and labor boards in each of the 50 states . Northern states typically model their laws and boards after the NLRA and the NLRB . In other states, public workers have no right to establish a union as a legal entity . (About 40% of public employees in the USA do not have the right to organize a legally established union .) </P> <P> A review conducted by the federal government on pay scale shows that employees in a labor union earn up to 33% more income than their nonunion counterparts, as well as having more job security, and safer and higher - quality work conditions . The median weekly income for union workers was $973 in 2014, compared with $763 for nonunion workers . </P> <Table> <Tr> <Td> </Td> <Td> This section's factual accuracy is disputed . Relevant discussion may be found on Talk: Labor unions in the United States . Please help to ensure that disputed statements are reliably sourced . (August 2016) (Learn how and when to remove this template message) </Td> </Tr> </Table>

What was an activity of the national war labor board apex