Collective bargaining is more of a cartel (a labor cartel in this particular instance) than a monopoly. As one of the gp's pointed out, collective bargaining is

Collective bargaining is more of a cartel (a labor cartel in this particular instance) than a monopoly. As one of the gp's pointed out, collective bargaining is not per se anti-free market (e.g. health insurance). Neither for that matter are cartels or monopolies so long as government interference remains absent. After all, free association is a right endowed to every market participants and it is a person's right to do as he/she will with it. I think the issue in this case relates more to national labor law creating uneven advantages for labor contra capital.