Or they just end up being controlled by a few union leaders, and then we are serving another middle man (union leader), who is probably only making himself richer in the process.

I have this feeling that usually unions tend to grab attention of more cunning people, who know how to play that system in their favor mostly, thereby hurting both the employer and the employee, in a even more hidden manner.

Of course, I have never been part of one, so this "opinion" of mine about unions is what I formed from hearing about 'em. Correct me if I am wrong.