In what world are unions never criticised? I'm in the UK and they are often reviled in the press and among people who don't work in a unionised sector. America has an even stronger tradition of anti-union feeling (maybe partly due to historic links between unions and organised crime but also because the US has often had a stronger collectivisation than most European countries - consider that the political centre in the US would be considered into right wing in most Western countries on most issues)