The Chamber of Commerce is one of the biggest advocates in the US of right to work laws, which allow individual workers to get the benefits of a union contract without paying union dues. Their purpose is to make it harder for unions to collect dues and thereby weaken them financially.
Back in 2005, a member organization of the Chamber of Commerce in Owensboro, Kentucky asked the Chamber if it could stop paying dues to the Chamber yet still get the benefits. This is what the Chamber said:
The vast majority of the Chamber’s annual revenues come from member dues, and it would be unfair to the other 850+ members to allow an organization not paying dues to be including in member benefits.
Hard to argue with that.