In this advert for the Swedish Trade Union Confederation (LO), the VO describes how your employer will have all these people on their side when you go to negotiate your salary. They'll have Human Resources, the companies law office, they might even get international legal consultation, and perhaps call some outsourcing experts. This ad has a few politically active people in it, you might recognize Anna Ardin who walks in from the right at the end. The VO ends with "Your boss also says it's best that you negotiate your salary on your own. If you want to even the odds, join LO (the union)"
LO - Landsorganisationen i Sverige