[akira2501]

The fundamental idea of most unions seems to be, that once labor recognizes that it is working for a monopoly, instead of working to break up that monopoly, they decide to form one of their own in order to gain some power of negotiation with their employer. Typically to the detriment of the consumer market and the labor market.

For new entrants into the labor market, as you've flagged, now they have to successfully negotiate between two overly large entities with predictably unfortunate results. Labor is best served as a competitive market and unions should only be used in the few limited circumstances where they are otherwise unavoidable.