Why does the Church sanction slavery by not paying its thousands of workers in the Religious Orders, who are scabbing on trade-unions?

The thousands of members in the Religious Orders giving their services to God in the Catholic Church without wages do so cheerfully and freely. The Church has no obligation to pay those who refuse to be paid. And this self-sacrifice of so many Religious is really sparing millions of workers further expense. Nor are these Religious scabbing on unionists, for they are doing no unionist out of a job that he wants.

Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty