There must be one mother of a guild protecting anaesthesiologists supply in the USA. Where I live, the governments (ie the people who are supposed to represent the other 99.999% of people who aren't anaesthesiologists) ruthlessly crush such behaviour in any profession that lets it become a real problem. We've fired most airline pilots and imported them, live without electricity for a while, imported doctors from anywhere and everywhere until the medical admission boards got the hint.
The USA really needs to get itself a decent democracy, where the pollies actually represent the people who elected them.