Doctors and nurses unionize now while you can!! You are being going to be replaced!!!! Don't let what happened to IT workers happen to you!!!
Well, of course that would have worked.
And if unions had campaigned on a program of opposing H1-B visas, they would have signed up enough workers to settle that question and scuttle the H1-B system permanently.
But they didn't do that campaign. And they are still avoiding the issue today. Which is one reason of many why they are no longer relevant.
I want to see your pitch to the Doctors and Nurses coming from actual union officials as part of a recruiting campaign. It might still work if done with a bit of style and a a professional flair.