I think that the original poster was referring to "traveling nurses" or "traveling healthcare workers." Some hospital systems and nursing homes "resolve" staffing shortages by paying large sums of money to staffing agencies for healthcare workers who are on short term contracts. These healthcare workers, referred to as "travelers" make a much larger wage than the permanent employees, but the staffing agencies also pocket a great deal of money from the transaction.

I am not a healthcare worker, but from what I understand, the practice of using "travel nurses" significantly increased during the beginning of the Covid pandemic.