Everyone in a hospital (except the patients) can join a union.
Goodfellow
M
M
University Research Center, Inc., Chicago, Illinois, USA.
D001900:Boston; D004651:Employment; D007325:Institutional Practice / Q000331:legislation & jurisprudence*; D007396:Internship and Residency / Q000331:legislation & jurisprudence*; D007750:Labor Unions; D013337:Students, Medical; D014481:United States