what about hospitalists? Are they considered employees or contractors?
Hospitalists are generally employees of the group that they work with/for, or of the hospital itself.
Look, the problem isn't strictly with being classified as an "employee" or "independant contractor" by either the group or hmo, or whatever that the doctor works for. Some doctors are classified as employees, some as independant contractors, of the group that they work for, which generally has a contract with the hospital to provide coverage. This stuff is beside the point for what we're talking about. The problem with unionizing or going on strike is that, functionally a physician acts as an independant contractor of a hospital/group in that they act according to their own discretion in how they provide the contracted service. In other words, because the group doesn't have the power to dictate how you practice, they don't "employ" you, they "contract" with you. Even if you are classified as an employee by the group, in the event of an attempt at organization, the law will side with them (and find you liable for any damages), b/c, functionally, you are not acting as an employee.
Most of this doesn't even apply to established physicians who are owners of their practice (ie partners).
You are, of course, free to end your relationship with the hmo/hospital/insurance plan, but if you try and get other doctors to do the same, you would be violating anti-trust legislation and you will quickly have your ass handed to you. Which is what happend to a few orthopods in texas a few years back when they all agreed to stop accepting a particular insurance plan.
Nurses don't have this issue, because, functionally, they are actually employees. Their bosses (the doctor who employs them in an office or the hospital they work at) can dictate what they do at work. Because of this (and the fact that they are blood-thirsty vultures who would bite off the head of a three-day old baby if it would further their agenda one iota) they can strike.