what's good for the union?

In a letter announcing a vote on unionization of part-time faculty at Tufts University, her deanship wrote: "We do not believe that unionization is necessarily in the best interest of the University as a whole or of all of the part-time lecturers."  Not at all surprising and it reads as boilerplate, but it makes me genuinely curious to know if any administration -- aka management -- at any time anywhere in the U.S. did believe unionization was in its best interest.