The '"government" does not do battle with "Doctor Colleges", whatever those are.
The provincial ministries of health have jurisdiction over the delivery of health care; these ministries cooperate with Colleges of Physicians and Surgeons in admitting physicians to medical practice in Canada. Doctors who have trained outside Canada/US should show they are qualified and competent to practice medicine. Just because someone says he is a doctor does not mean he is:
A recent immigrant to Canada was working at the local convenience store as a clerk. He would tell customers he is a doctor and he trained in nuclear medicine in his previous country and really wanted to work in Canada as a doctor.
He said he had already sent his CV to some "higher officials in the government" who he hoped could find him a job. His previous country had taught him that contacting officials in government could find him the job he wanted. He was waiting for their reply, but was frustrated at their lack of response. He said maybe he should be writing to officials who were even higher up, because he still did not know how much the "fee" would be to take the job.
When asked if he had submitted his qualifications for assessment to the licensing body, he said, No, not yet, because he was not aware of how to do so, and besides he was still waiting for "higher officials" to contact him. He was provided with contacts in the RCPSC and the College of Physicians and Surgeons in the province, that is, the organization that does assessments of foreign medical training, and the organization that issues medical licenses. He was asked for his CV. Upon review of his activities, it was noted that he was trained in ultrasound technology. Subsequently, he was then given the contacts for an organization that reviews credentials of internationally trained health care workers. He is now working in a clinic and using the skills he learned previously.
But he isn't a doctor trained in nuclear medicine.
Canadians who graduated abroad are selected for residencies in Canada.